Sorry for perhaps not being clear enough with my definitions, I'm not used to discussing Ledall outside my group who all know exactly what I mean.
The 'Spring' is an attack accompanied by a leap, as set out above, that changes the line of attack.
I think most of Ledall's stuff is conceptual rather than specific techniques, though I'm perhaps not explaining that properly.
I'll use the 'quarter' to try and explain myself.
In the plays we have quarters to the head, the hand, and the leg, and in a poem from slightly before Ledall's time we have a "quarter-stroke" to the body made with a staff. We also have 'quarter void', 'quarter standing still', 'quarter above his head', 'quarter full', and 'quarter fare before you'. To me this is simply too much for a specific technique, it needs to be more general. A 'strike from above' works well for me, though I have to acknowledge that there are times when he is more specific, like the 'downright stroke'. The 'downright stroke' is a form of quarter that comes from the right on the outside, rather than along the centre line, but again it's execution will change slightly depending on the situation.
If you take this general approach to Ledall's work it becomes much easier to follow where he is coming from and where he is going with the plays.
So, with the 'spring' you can get that it's the concept of a leap, of some form, used to change the line of attack, and it is relatively apparent that it's meant to include some form of attack, but I would also argue that it's equally apparent that that attack can be of different forms.
In the 17th Counter we have a 'spring at his face', looking at the other times Ledall uses the face as a target we only get two associations; the 'proffer' and thrusts and they are in some ways both related to each other. My interpretation has that the 'proffer' throws out the point along the centre line as the opponent closes in to attack, the result is that if I were to ignore my opponents attack then my opponent would walk his face onto the point of my sword, a passive thrust to the face as it were. If I'm correct and we keep true to Ledall's use of the face as a target for a thrust then, in the 17thcounter we have a thrust to the face while leaping off line.
As you mentioned in the 18th Counter we then have a 'full spring at his leg', and while it would be possible to thrust at his leg it seems a little lacking. However, if we look at the play as a whole we can see the spring put into context, and surprisingly an alternative, that allows us to see what Ledall is trying to achieve with the play.
Ledall wrote:The 18 th callyde ye duble rabett
A profur a rake with a full quarter lyghtly sett in the lyfte legge with a rabett stondyng styll lyghtly pley another rabett wyth a full spryng att hys legge other ??? sett in ye ryght legge with a downe ryght stroke att hys hede and a full quarter another a voyde and be att youre stoppe.
my translation wrote:A proffer, a rake with a full quarter. Lithely set in the left leg with a rabbet, standing still lithely play another rabbit, with a full spring at his leg, (otherwise set in your right leg with a down-right stroke at his head) and a full quarter, another, a void and be at your stop.
For me we have the 'proffer, rake' which deals with the opponents attack, followed by a quarter, which looking at previous plays of the 'proffer, rake, quarter' has the quarter on a right pass, so attacking from the right. The rabett is a beat followed by a strike from the left, and another doing the same; this forces the opponent into a strong defence on his right side. The next part of the play then has two options, the spring to the leg or a downright stroke on a right pass.
The Downright stroke in my opinion is, as I've mentioned before, a powerful attack from the right on the outside, if you step off line while doing this it is going to mean that your opponent has to move from his overly strong defence on his right to defend his far left. If instead you play my version of the full-spring and strike to his leg (I'd aim for the knee) your going to force him to move from a strong right, high defence to a low, left defence coming in behind him, a much stronger situation which is why the downright is put as a secondary alternative.
Coming after these you again strike a high quarter from the left, and another to the same target before stepping back with a quarter void. Again, your switching sides, applying lots of pressure to his right before switching again to strike to his weaker side. Over all the play can be describe as; attack weaker side, force defence on strong side, attack opposite onto weaker side, force defence on strong side, attack different place on weaker side. It's all about manipulating your opponent and trying to stop him predicting what your going to do,just compare it to something like the 5th counter.
To me this is what Ledall is all about, setting your opponent up using general concepts with the odd bit of specific technique thrown in.
Sorry for hi-jacking the OT!