Ten on a wall

The workout:
10 hs push-ups against wall

Last night I put a pillow on our wood floor to pad my head, did a handstand against the wall and busted out 10 hs push-ups. It amazes me that I can do 10 on a wall without leaning on it all that hard but ZERO from a balanced hand stand. I think my posture and hand position must be different in the two scenarios. I'll have to check out that theory tonight.