first off, hello all, glad to be a member here at the forums.
In MY opinion in that situation shared with everyone, I would have gone all in with the A6. Jammer was right about the short stack thing in late game play, either make a move or bow your head and take the walk to the losers lounge. I have found that in late game "free-rolls", people tend to fold to pre-flop raises if they are raised to an all-in behind the big blind. I have played in quite a few free rolls on just about every poker site
online. I have finished in the top 5 in stud, and have won 1st in a several low entry free-rolls as well as a 2000 person freeroll on absolute. I play poker roughly 8 hours a day to tweek my skills, and just like everyone else, its all luck and knowing when to stay and when to get the heck out is the biggest question to answer to yourself.
Online free-rolls go in one of two directions for me. In the final 50, or out in the first few rounds on a bad beat. Getting through the first few rounds with yahoo's going all in with their 2 7 os is a kick to an A K and loose the hand and end your game saying those o so loosely used bad words, but I have found that late game action is roughly 70 % bluff and 30 % play (in my observations).
Anyways, the site rocks and hope to see you at the final table of a tourney soon.