Well the Aegis works both ways, so I'm sure he has some idea, and Fen too. Since this was so successful, I can eventually see it being intergrated into Page training. Even if it becomes a "What happens in the trenches, stays in the trenches" kind of thing, keeping a fellow Squire (and thereby their Knight) alive through that kind of pain must be added to the training.
Humanity's contribution to the war and saving lives (Make love, not war).