I was doing the quarantine patrol tonite at the Giant's Husk. Killed the captain and finished two waves of fallen from the ship. However, on the third wave, the fallen did not drop from the ship. It wasn't shooting at me, the canons on the ship moved towards my direction, but it did not fire. A public event (walker) triggered after 5 mins, which I completed. The ship was still hovering in air and it continued to remain till I went to orbit (~15 min). I hope someone at Bungie reads and responds to this. There is already one type of patrol activity that has issues and now this is another serious flaw.