set of ducks, your play?

Is a check/raise here the best play or is it too likely to scare everyone off? Would it have been better to lead out? How do you play this one?

POKERSTARS GAME #2231848138: HOLD'EM NO LIMIT ($0.50/$1.00) - 2005/07/31 - 17:14:25 (ET)
Table 'Demophon II' Seat #4 is the button
Seat 1: Humbo63 ($16.05 in chips)
Seat 2: Thanks_mate ($71.60 in chips)
Seat 3: alepa ($121.85 in chips)
Seat 4: dadyfatstak ($27.20 in chips)
Seat 6: andr3w321 ($82.05 in chips)
andr3w321: posts small blind $0.50
Humbo63: posts big blind $1
*** HOLE CARDS ***
Dealt to andr3w321 [ ]
Thanks_mate: calls $1
alepa: raises $2 to $3
dadyfatstak: folds
andr3w321: calls $2.50
Humbo63: folds
Thanks_mate: calls $2
*** FLOP *** [:Ks: :Jh: ]
andr3w321: checks
Thanks_mate: checks
alepa: bets $9
Ryguy14 joins the table at seat #5
andr3w321: raises $11 to $20
Thanks_mate: folds
alepa: folds
andr3w321 collected $26.65 from pot
andr3w321: doesn't show hand
Ryguy14 leaves the table
*** SUMMARY ***
Total pot $28 | Rake $1.35
Board [Ks Jh 2h]
Seat 1: Humbo63 (big blind) folded before Flop
Seat 2: Thanks_mate folded on the Flop
Seat 3: alepa folded on the Flop
Seat 4: dadyfatstak (button) folded before Flop (didn't bet)
Seat 6: andr3w321 (small blind) collected ($26.65)

yep. in we go. This is a live flop with straight and flush draws. Take it down if you can. Call any reraise AI

I see the pot sized bet there as him holding AK or KQ. Looks like a good scenario for slow play. You isolate to one plr who repp'ed TPTK and you play like you are drawing: weak leads, minraises, check, etc. Against a loose plr you can sometimes get them pot comitted and suck 'em dry. There's always the risk that he's also got the flush draw but I would give a card here and hope to build the pot on the turn.