Need help with root

[Ron Burgundy]

there is a root on the top left of the map, all the way over. its sticking out the side of the tall stone tower thing. there are vampirez/bats flying around but i dont know how to set it on fire.

[Ron Burgundy]

nevermind i got it. for anyone who didnt get it yet just throw a sticky explosive bottle onto a bat and when he flies up to the root shoot it