Here's my theory on the yasuo skin

So here's the rub, my theory is (and it's just a theory) the little fire guy is yasuo's soul. So my first piece is when he backs he smashes the little bottle and he starts to transform which makes me think he's "rejoining" with his soul and that's why he gets really powerful looking. The second is when he gets killed the little bottle implodes killing him and making his body disappear.