Recently, the Ranger in my group started to use this power :
Hunting Party / Ranger Utility 10
Daily ✦ martial, stance
Effect: Until the stance ends, each time you miss your quarry with an attack, you can choose an ally within 5 squares of the quarry. If that ally hits the quarry before the start of your next turn, the ally's attack deals extra damage equal to your Hunter's Quarry damage.
I've found some answers on the site, like this one: Do Warlord powers which affect an attack apply both attacks of Twin Strike?
But still, my question isn't answered. If the ranger misses with one attack of Twin Strike and hits with the other, does the miss allow them to grant the Hunting Party bonus to an ally?