You can head this off by looking at coach B immediately after the whistle with the "I've got this" look -- and maybe even use those words.
If you have time for a longer talk "If you (or he) yell 'foul' and it isn't, we just play on. But if I blow my whistle and then say 'oops' it's a big deal. So, my whistle will always come after you could say something."
Or, to coach B -- you know, if you keep yelling for the call before I can make it, it looks like you are influencing my call and I might not be able to make it.
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