hmmm.. i did sirious (couldnt compleyed though, we were all new and wanted to figured out.. was fun but couldnt figured out the second boss before time ran out) and i didnt noticed this, at sm point the emity was yellow and i had to stop.
i will agree with someone above, i like playing together c the tank watching my hate, though no always work.
havent notice any issue yet, but havent play enough to noticed