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Thanks for the answers. The more I think about it, the only thing a "half bet" rule in NL can mean is if the all in amount is less than 1.5x the bet, then it is considered a call, if it is more than 1.5x the bet, then it is a raise. So the all in play should be treated as either a call or raise, and everyone else in the hand gets to act accordingly.
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Strat, this is a bit nitty, but so you aren't surprised in a game where folks do follow the rules, the half bet raise idea is a limit concept. In limit, an all-in for over half a legal raise re-opens the action. However, in No Limit, only a full size raise re-opens the action.
See Roberts Rules of Poker, Section 3 (General Rules) #7 under the betting and raising section:
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7. In limit play, an all-in wager of less than half a bet does not reopen the betting for any player who has already acted and is in the pot for all previous bets. A player who has not yet acted (or had the betting reopened to him by another player’s action), facing an all-in wager of less than half a bet, may fold, call, or complete the wager. An all-in wager of a half a bet or more is treated as a full bet, and a player may fold, call, or make a full raise. (An example of a full raise on a $20 betting round is raising a $15 all-in bet to $35.) Multiple all-in wagers, each of an amount too small to individually qualify as a raise, still act as a raise and reopen the betting if the resulting wager size to a player qualifies as a raise.
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And this is Rule 3, under section 14, No Limit and Pot Limit:
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3. All raises must be equal to or greater than the size of the previous bet or raise on that betting round, except for an all-in wager. Example: Player A bets 100 and player B raises to 200. Player C wishing to raise must raise at least 100 more, making the total bet at least 300. A player who has already acted and is not facing a fullsize wager may not subsequently raise an all-in bet that is less than the minimum bet or less than the full size of the last bet or raise. (The half-the-size rule for reopening the betting is for limit poker only.)
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Link to Robert's Rules of Poker