Block/Charge out of primary

[hbioteach]

I'm the R and the T on the play.
Jump ball. A1 passes to A2. A2 driving down towards the basket on the opposite side in front of the lead. I'm the T trailing the play. A2 dribbler contacts B1 at lane line and B1 falls to the ground right in front of the lead who has a good angle on the play. No call. A2 is then fouled by B2 called by the lead.

Would you as the trail come in and make the charge call? I thought a whistle was needed because of the contact and displacement but passed because it was right in front of the lead.