[Spook]

[ QUOTE ]
4. You can not complete here. The players all in for 2 more (which is less than half a bet) does not count as raise. Since it was not a raise for you to complete his bet would raising your own bet. If the all-in player had acted before you, your choices would have been to call $2 or complete to $6.

[/ QUOTE ]

Or, if a player goes all in for less than half the bet - it does not reopen the betting round for anyoone who has already acted. (someone who hasn't acted on action previous to the allin raise, still has the options to raise to the completion, and reopen the betting to everyone)