Hello Mike,
I really think that the problem of headphones, combined with player 7 pushing the call into the pot, while contemplating the amount of the raise is the problem. What happened to pushing the full amount into the pot? I don't know where that rule came from (putting the call in first and then the raise later....stringy). If we are to follow the rules, then the dealer acted properly and stopped the action in time, therefor Player 8 had every right to retract his bet or raise. If Player 7 pushed his complete raise into the pot, we wouldn't be having this discussion. I read that thread again, and I still see Player 8 raising, thinking that Player 7 just called.
That's how I see it.
Nick C