If you had a HUD running, and he had solid TAG stats like 21/17 or 18/15 with that small gap between VPIP and PFR, then it is worth pausing for a while here and considering, why a TAG suddenly open limp with a 10BB stack. That would indeed scream of the old silly limp trap, and I could see just taking a free flop with AQ. But apart from such information we simply can not put this player solely on aces or kings. This is a 3,5$ SnG, and lots of players are just bad and limp with all sorts of hands, they should have either jammed or folded.
Also with your specific holding its not like, you would have folded to an open jam, so its not even like, his "trap" gave him anything extra. The guy basically just got lucky to wake up with KK, when you had AQ in a situation, where stacks were short, and the chips had to go in preflop. So I certainly would not beat myself up over this one. 9 man SnGs are grinder games, so just register for the next one and hope for better luck next time.
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