This situation came up last night at DTD on the £0.50/£1 tables.
I 3-bet someone from the SB holding

. He had raised to £6 from EP and I re-popped it to £30. He called.
I don't want to go into the hand particularly, rather my opponents' actions and what they mean.
As the flop was dealt I was looking at the player. He just carried on looking at the flop until I checked the

flop and he instantly (and I mean instantly) picked up a seemingly random number of chips, (£35 as it turned out) and tossed them into the pot.
So basically his action was so quick it was predetermined. So this as I see it, is polarized - he is either committed to a hand like aces or he has absolute or near air and has decided to bet if I check come what may.
He was leaning forward, staring into the felt and his hands were covering his cards. He occasionally diverted his eyes over to me but would then go straight back to staring at the flop.
Ok, so I call his bet and basically the same thing happens on the turn, well, not quite the same - he instantly puts me all-in. I'll be honest, sitting here now I can't remember the turn card but it wasn't paint and it didn't complete a draw.
How do we gather which of the two scenarios we are up against? Predetermined play with AA or predetermined bluff with two missed overs (like mine)?
I know this is an overly simplistic question, but I want to focus on this type of betting action rather than the actual hand and how I should play it.
Does anyone recognise this scene?