Here's another interesting educational hand from a $2,100 no-limit hold'em tournament.
The blinds were 150/300 with a 50 ante, and the effective stacks around 11,000. A player in the hijack seat raised to 800, and it folded to me in the big blind where I was dealt .
In the video below I discuss pros and cons of three-betting with a hand like ace-jack — it depends both on your opponent and on what kind of three-betting range you have. I typically would just call here when heads-up versus an unknown player, and that's what I did in this case.