Player on Floor Legal Guarding Position

[vbzebra]

ok, i'm confused, so I'll play devil's advocate for a minute...

A1 is dribbling up the floor and say for the sake of argument, B1 is lying totally still on the floor (or on all 4's, barking like a dog from way back in the day

With B1 lying perfectly still, A1 dribbles and trips over him/her and falls, this would still NOT be a foul on B1? I know LGP is two feet on the floor, torso facing opponent, but I also understand everyone being entitled to their spot on the floor...

I actually had a rebound situation last year happen to me...B1 falls on the floor, A1 gets rebound and turns to go upcourt, trips over B1, falls, I call block (now granted, B1 WAS moving around like a turtle that got flipped on its back, so B1 was NOT totally stationary, which made it easy).

I'm not trying to be a smart@$$, I'm just really trying to understand this. I know if there is even a LITTLE movement by floor-ridden B1, we've got a block. Just trying to grasp the other side of it. sorry