Rule Clarification

[BigToe]

I worked a game last night. Here is the situation. A1 is holding the ball in his front court. B1 slaps the ball away from A1. The ball hits A1 on the foot and then rolls into A1's back court. A1 is the first to touch the ball in A1's back court. My partner blows the whistle and calls over and back. A coach doesn't agree and asks if R can ask for help. My partner asks me and I tell him it is not over and back because once the ball got knocked away, there is no team control. My partner disagrees with me, says that because the ball hit A1's foot, it is still team A possession and since A1 was the first to touch the ball in the back court, it is over and back. Then my partner says he is the R and it is over and back and we moved on. I should clarify, the call was in his area as well.

Question: Is the situation I described over and back or just a loose ball?

Thanks for the help.