1/2 foxwoods ratholing question

[monkeymaps]

sunday while I ws playing 1/2 a player won a pretty good pot got up and left. About an hour or so later the same player came back and sits @ the same table (there was a list at the time) and buys in for less than he left with. There was some question as too if this is agianst the rules or just poor form. The dealer did not really have a answer for me and the guy that ratholed kinda sucked so I didnt care that much but is there an actual rule about this?