Inbounds play - inbounder delays entry

[rfp]

Saw this the other night. GV game, 10 seconds left in a tie game. Team B inbounds under their basket. Inbounder B1 passes into the corner and then remains out of bounds for approximately 3 full seconds, in what appears to be part of their inbounds play strategy, so the defense loses attention on her. After 3 seconds she comes inbounds at the box, receives a pass and puts up a lay-up for the go-ahead score.

What's the right call? More interestingly, would you make it? Gut check time.

In this OP, no call was made. Team B wins by 2 on this game-deciding play.