From all the info I could gather (and the way OP express herself) in this thread. Following is purely my educated guess.

The most likely reason for the warning seem to be “revive”

OP have mention she only Swift cast and only hard cast “valuable” team members. So I believe some member got left on the floor, and I believe there are some verbal argument between said member and OP?

Since OP have not mention the reason/s for not reviving those/that member, I think GM look into the log and come to conclusions of the warning.