[Raymond]

Where was the play? If it was outside the paint on strong side C doesn't need to have a whistle as either the Lead or the Trail should be able to see it.

If the play curled into the paint that the C has a good look and either the Lead or the Trail is most likely straight-lined so the C and whichever of the other 2 that had a open look should have the other whistle.

Also, if there has been any rough play previously the crew might have just been hyper-sensistive to any possible scrums.