10 handed, 5k 6 max event. UTG is David Benefield, who has just been playing nitty and straightforward, opening very little and 3betting almost none. UTG +1 is 35-40 year old dude seemingly from LA, has surprisingly opened a lot but has not 3bet that much, but certainly not as low frequency as some old nit.

Effective stacks 19k. 100/200 blinds.

Bene opens UTG to 600, LA dude looks at his cards, and in about 8 seconds raises to 1600. Folded to me in HJ. I have KK. I look at LA dude and hes not even looking at me, refusing to pay attention to any other action. He also seems extremely tense.

I call the 1600. Thoughts?

Everyone else folds, Benefield calls.

Flop comes 874 rainbow. Benefield checks, LA dude semi quickly bets 2800. I look at Benefield and its unclear whether he is thinking of continuing or not, he certainly doesn't look like he is going to snap fold.

I call/raise/fold?