Stalling in chess.com tournaments?

I am playing in a tournament right now and there is a player that has only moved five times in over six and a half weeks! The tournament unfortunately does allow vacation time, but it rarely says the guy is on vacation, but when he gets down to about six hours left on his timer it suddenly jumps him up to 36 hours of time.  I can't remember when the last time the guy has moved. What's going on with the guys' timer?  Is he intentionally stalling to get others frustrated and forefit? Anything I can do about it? Most games are complete amongst twelve players, but his only decisions are forefit wins.

He is probably going on vacation and coming off. If you go on vacation for one hour, the remaining 23 hours get added to your time.

[Edit] Your page currently shows one guy you are playing against on vacation.