how bad is this angle shoot?

[PokerBob]

Last night in the Canterbury 30 game, I twice saw a guy say "big blind" when HU on the river and toss out 3 chips. (He obviously was UTG in the hands in question, and was BB next.) He had not tossed in his cards when he did this. In the first case his opponenet thought it was a call and tabled his hand. The guy had a bit of an accent so it wasn't completely clear what he said. He tried it on me later as well, but I was aware of it so my hand went in the muck. I was very tempted to call the floor and ask that he be required to call, but decided to let it go. How bad is this angle shoot of his?