When did he learn all of this?
He never recalled himself studying medical stuff or even self-instructing himself about doing first aid. The obsidian eyes of his eyed at the bandaged ankle. It looked perfect like it was done by an experienced medic.
Even though he wanted to praise himself for having a knack for it, he was still confused.
How?
When?
Why couldn't he recall it?
He might not remember it psychologically, but physically, his body, more importantly, his muscle memory, was working exceptionally well. This particular movement and action he did was without conscious thought as if it was a result of something he had frequently done before. Not now, but before.
Way before he suffered amnesia.