Now! If no blacking out had been done on this frame, what would we be seeing:

Well, if Mr Oswald is indeed DarnellPrayerMan, then we'd be seeing
---------------Mr Lovelady's right arm (long-sleeved) terminating in a hand
---------------Mr Oswald's right arm (sleeves rolled up) terminating in a hand.
Too many arms/hands-------------they both gotta go!If Mr Oswald is not DarnellPrayerMan, then we'd be seeing
---------------Mr Lovelady's right arm (long-sleeved) terminating in a hand
---------------Mr Oswald's right arm (long-sleeved?) terminating in a hand.
Too many arms/hands-------------they both gotta go!And if
this frame hadn't had been subjected to blacking out, what would we be seeing?

--------------Mr Lovelady's right side
--------------a full view of Mr Oswald's head and a significant portion of his upper body, for Mr Lovelady has moved downwards while Mr Oswald is still where he was up on the landing
Too much information-------------some of it's gotta go!Least worst option: let's make it look like a shadow going down Mr Lovelady. No one will ever notice that a shadow on someone standing there is a complete physical impossibility! 