In the game "Fallout Shelter" there is a description of one of ingame items that caught my eye. It's about a weapon ("Armor piercing sniper rifle"), and "Vertibird" is a type of combat aircraft:
Kill the soldier, and the Vertibird he flies in on.
This "in on" is giving me trouble here. In obviously describes relationship between the soldier and the aircraft. On feels like description of soldier's action, but I can't really understand what action it might be.
What is the meaning of "on" here? What rules govern such constructs?