What was the situation when the move was made? Where were all the goblins? What was happening, fictionally?
I think Dungeon World moves are more vague than Apocalypse World moves, but it's still the same basic system and that requires a fairly detailed, visceral description of the imaginary positions and events. You know, "to do it do it". How was the halfling making a stand?
It might sound pointless, but it matters in AW and I believe it matters in DW.
The outcome sounds fun and awesome, so if that's good, then it's good. But I probably wouldn't have handled it that way. First off, were all 10 of the goblins really nearby, so that he could defend against them? Were all 10 of them attacking him at the same time? In my opinion a move should rarely resolve a whole scene or conflict. I am not questioning your judgement, but I think this brings "Make a Stand" in perspective relative to "Hack and Slash".
As a side note I was talking to Sage about this move and I think there's definitely a problem with it. I think it's (amongst other things) because original D&D doesn't really have a "Constitution Move" and it's hard to reincorporate it.