If it helps at all, remeber that when you shove with 84s and get called by ATo it isn't gg immediately, you still have about 38% equity to scooooop a lovely pot
This is always my thinking in these spots.
When he finally found a hand it was AK and I had

I had 20 outs by the turn but missed.
I don't think I play it any differently against this particular oppo because the FE was huge.
Some very interesting points from everyone else regarding the widening range and speech that he made.
I saw his speech the same as mos. I thought it might actually narrow his range temporarily. Unfortunately it didn't narrow it beyond AK.
I did give him a pass at one point. I showed Q4 and he was delighted to be able to show 10 4. This definitely helped get a couple more through when he realised that I was capable of passing.