Time out with foul?

[wyo96]

BV, 3 man crew, normal game intensity.

Quick loose ball in transition at B's end of floor.

A1 is on the floor and has just gathered the ball, the T grants coach A an time out, (air in whistle). B1 is scrambling for the ball, and comes over the top of prone A1 with contact. The contact is after the whistle for the time out, but there is no time for B1 to react/stop. (in real time it looks almost simultaneous, but it is defiantly after the t's whistle, less than 1 second) C blows the whistle and has fist in the air for a foul on B1. The contact by B1 is normal, and would be a common foul, not intentional nor flagrant, just a hustle foul.

Crew grants the TO, and does not report a foul.

Post-game discussion on issuing a dead ball foul on B1.

Would you call a DB foul in this situation?