Soooo...... back to the action.
After Seat 7 announced all-in, the floor was called because Seat 8 obviously wanted his ill afforded raised back. Had he not had headphones on he would've heard the raise announced both by the player and the dealer.
The first Floor person was called and was inclined to the let the player take the raise back because the action had
grossly changed, even though a raise was announced. Just not how much. The other players at the table were outwardly verbalizing their displeasure with the prospect of the chips being taken out of the pot when technically, they were bet in turn, with malice and carelessness.
The Floor person then happened to see the TD and consulted with them.
The TD gave their thoughts on the situation outwardly speaking of their thought process and said they were inclined to make Seat 8 leave his chips in the pot and was about to give his final decision when Seat 8 had an outburst and stated how wrong the TD was and that if that's the case then HE TOO IS ALL-IN!! He didn't even wait for the decision.
The TD then explained that if Seat 8 would've let them finish their explanation, that they would've simply made Seat 8 leave 8,000 in chips in the pot, the minimum raise that Seat 7 could've made, and then Seat 8 would've been allowed to reconsider his further action.
I rather like this decision. IMO, both players are angle-shooting to gain an advantage.
It's very clear that Seat 7 only went all-in because he thought Seat 8's chips were going to be required to stay in the pot. It's equally clear, that Seat 8's intention was to raise also, but cried foul after Seat 7 moved all-in.

Turned out they had similar hands and chopped.

No penalties were given. But the headphones came off. Seat 8 paid more attention after that.
This is one example of why I like the WSOP rule of no headphones/earphones when in the money.