After the video ends, you need to use the chair to get on the ledge which needs another rifle grenade. That leaves you with 0 nades for level 16. So at some point between level 15 and the conveyor belt jump in level 16 you need to use something other than a rifle grenade.
Oh yeah, damn.
So a karbine jump at either level 15 start or level 16 start still needs to be replaced with a grenade-crossbow-jump, preferrably 15 again, because it is closer to the segment start.
So a karbine jump at either level 15 start or level 16 start still needs to be replaced with a grenade-crossbow-jump, preferrably 15 again, because it is closer to the segment start.