Torchwick might not be dead:



1 . He had full Aura



2a . Grimm disintegrate when they die

2b . Ruby immediately killed the Gryphon after it swallowed Torchwick

2c . The Gryphon swallowed him whole

2d . Roman had his Weapon with him



3 . The airship went down slowly enough for him not to get killed in the crash



4 . The Atlas robots went offline after the ship crashed. This was so Torchwick would be able to get away without them shooting him.

Think about it: the Black King Virus Torchwick uploaded to the ship caused the robots to shoot the humans, not the Grimm. Turning them off would be less dangerous for him, since it would mean the Hunters would be fighting the Grimm and the Grimm would be focused on the Hunters rather than being attacked by four sides (including the White Fang), it's narrowed down to three. It also would be a bad strategy to have all the robots shut down if the flagship was destroyed, so Roman must have disabled them before escaping from the ship.



5 . Torchwick is focused on survival: ironically enough, it's talking about this that got him attacked. So he wouldn't stick around after the battle. He probably met up with Neo and got out of there.