[Khabbi]

As the floor, I'd find out what the dealer heard and what any other player who might have been paying attention heard.

As WE1, since I heard call, I'd make that my ruling.

As E2, if I heard call, I'd make that my ruling.

As friend I would tell him he said call and his first verbal action is binding. He'd understand that he doesn't get any favortism because that would discredit my game, and as my friend he doesn't want to do that.