Even thought I’m drunk I’m going to describe where all 5 grenades get used. (YES 5!).
The first one gets used where you boost around to Gman or wall climb over. You get punished more for wall climbing.
The 2nd one is getting over a (INVSIBLE CLIP) and surfing along a cliff in order to get a decent abh start.
The 3rd one is to enter the helicopter vs speed runner fight scene.
The 4th one is a grenade which we use to destroy planks which really help our escape from cutscene’s.
Save’s us being blown up by Combine’s.
The 5th one is to jump over part of the debris which prevents us from accessing the ability to raid the cannon snipers to quickly.