220 runners around 50 left, 36 paid
SB - Ali Mallu, 150k
BB - Jamie Holland - c400k
UTG - Me - 260k
Blinds 3000/6000/1000
I've started Day2 with 30,600 chips and been on a bit of heater. Now well above average. Jamie Holland has been fairly active although he claims to have 'had the cards', Mr Mallu has also made his share of raises although he will claim later that he's been tight...
I have

and elect to flat in hope of seeing a cheap flop. I don't want to raise fold, but am favourably inclined toward calling a standard raise if necessary.
The table views my limp as 'suspicious' and it folds to Mr M who seems reluctant to make up the blind but does so, and Jamie Holland checks with a knowing look at me.
Thoughts on this? It achieved the aim, but I don't like open-limping and felt 'dirty' doing it.Flop

Both blinds check to me - I bet 17,000
Comments? It's somewhat outcome dependent to say checking behind avoids the issueAli Mallu moves all in for 144k total
Jamie folds
I know I should have a plan here, but I hadn't expected him to move in for 24 BBs at this stage of the hand
What do we expect him to have when he makes this move here?
What do we do?