[Seven_of_Cups]

I am playing in a 7Stud game right now and I noticed a donk of a player go south. He had bought in for $5 and after a few hands took a decent pot. He was up to $8 then left the table but returned immediately with only $5. I know that UB doesn't allow a player to return to the table with less than they left with for 15 minutes but I thought all sites did that. Whats the deal? He did it a second time..will FT do anything if I tell them about this?