This is a possible sound but, so I can't provide any screen shots... however, some time ago, I noticed that the attacking sounds (you know, those bang, bang sounds?) disappears randomly, at first I didn't think it was much, probably my computer fizzing out. After some matches with Osiris, both times the sound went away after he uses his catapults, it got me wondering... is that the cause?
I remember playing against the elder with armagios, catapults, and auburn nymphs when my sound disappears as well...