i heard the news about the marine animations made by a guy(srry guy i 4gots yoah name)
that has an animation of a grenade throw like a spartan's. u dont need to wait until the grenade throw animation is done.
also does it have an animation that lets the marine wield a flamethrower?

but heres some news on how to make your marine biped talk when it gots damaged.
its pretty easy actually, open the marine dialogue tag and replace the pain minor sound with the hurtenemy sound; and the pain major sound with the hurtmountedweapon sound. these sound tags are located on being hurt folder.