[budblown]

I don't know why people automatically think it was an angle shoot because player 1 called prematurely. Player 2 may still be deciding how much to bet. Please re-read the statement above about rule 13 - I believe the rule says "releasing chips" which the player clearly did not do. If the bold part is supposed to mean something in this situation it doesn't. No opponent showed a winning hand while betting was taking place.

Now, player 1 knows exactly what he is doing in this situation. This is a play I use atleast once a session. Say I'm player 1 and check the river, as player 2 begins to put chips in the pot to bet I instantly say all in. Now player 2 doesn't know what to think and more times than not they fold. The difference between OP and my situation is the person had released some chips in my situation (stacking stacks of 5 trying to bet 15) thus allowing him to fold at around 10 chips and save the last 5 (because he hasn't released the 3rd stack of 5).