Commentary
This play is showing an alternative defence to krucke siege. The defender may do a krucke of his own, so that the blades cross each other and stop. The one who is faster can then slide his blade in a thrust into a stomach of the opponent.
The play also warns us that such thrust is potentionally risky, because the opponent may at the same time strike at our undefended head. And shows how the strike in the head should be defended. The defence is possibly based on the reaction from the play of binder and the bound, because the attacker has to leave the bind if he wants to strike our head. But swuch connection is not mentioned in this play.