[One-Whistle]

Here are some of the questions that I have about this play.

For your "partner" to be right; B1 would need to take possession of the ball before his foot was on the line and Team B would need to request a timeout PRIOR to B1's contact on the OOB line.)

Last and most important (in my mind), why is your "partner" overruling you? My partner would need to convince me that s/he clearly had the TO request before B1 was OOB.