At these stakes villain could do this with a low flush and shoves for protection but perhaps more to get worse hands to call him off as it looks bluffy. Way too many chips to call off with just 6 outs (two 7's, two 4s for a fully and two for the straight flush). No need to call off 55bb with another bluffcatcher.

87 for the gutter also got there, so except for (semi-)bluffs you wont be ahead most of the times.

i’d fold here

he def has a made hand – looks like 87 that hit gutter or SC’s that got there for the flush and is scared of getting outdrawn

we’ve got 4 outs against an almost 3x pot bet

“you have a nice stack with little invested, don't risk it” – Exactly my thinking, but tempted with the SFD out there!

Also agree that I was too passive, taking control always gives us more chances to win the pot.  I'm fairly new to MTTs (45s SnG player) and not used to the deepstack play, defo a weakness in my game.  Would you 3bet all PP if in pos with these stacks, at this level?  How about OOP?

i would 3 bet him preflop here because of his stack. If it was bigger I might be more inclined to setmine, but since we can’t setmine profitably when he only has 23bb to start the hand, I want another way of winning the pot. Taking control and putting pressure on him for his tournament life will give me another way of winning it without being dependent on me hitting a flop or him missing it. It also stops people who may be thinking about a squeeze and isolating him if he takes it to a flop