I'm gonna set up an example first.
Ok so you're battling it out solo style, As this won't affect many party goers. And you have around 1-3 Health capsules, You then find you're on low health and from no where you get smacked and then you're down... Annoying? Only options; Waste precious expensive energy, or go back up to haven and cut your loses.
This can be extremely costly thing to do sometimes, For example... You're in a boss fight, or arena... And this happens, Well either take the cost of wasting around 520 CR (10 CE) or going up home without those juicy end prices.
I'm only suggesting to see if there would be any flaws with this idea, But if the downed knight has any health capsules, he'd be able to revive himself using thus health capsule. It would make soloing much less of a risky task.
C&C (comments and criticism for new internet'rs)
well if u re low on health just press 1-4. and if that would happen no knight would use his capsules whiles he was alive, if u dont want a risky task dont go solo unless u know u can pull it normally.
ill give u a few exampes where that would make it way easier, u got 1 capsule, u dont wanna use it ofc, and u re on last wave in a BA, so u know once u clear all those there u have infinte health w8ing, with your idea u wouldnt have to risk your capsule cuz u know if u dont die u saved it, and if u die, oh well didnt lose anything by not using it. the same happens when u re in the end of the floor b4 the terminal. or when u re in the end of the last floor b4 rj or vanadule.