Well, she bit Ash probably at the end of her reach (15 feet), so depending on whether he expanded 'towards' or 'away' from the dragon, he would or wouldn't be able to reach her anyways. :P<br/><br/>Since we're not doing this without a map (Because I'm lazy. ::)), I kind of went liberal with the fluff. But it takes up 15 by 15 and the reach on its bite is another 15, so it's not too implausible that it could reach Arren stationary, or at the very least, take a five-foot step.<br/><br/>In that case, though, why didn't the dragon make a full attack action? ::) ...Flip a coin, heads he expanded towards her, tails away from her. If he's in range, make an AoO. :P