jeez, you have so many ideas and i can t believe you want to come up with more! a lot of these sound really unrealistic, but i think its a lot of fun reading all of these
i wouldnt think a grenade would do something like that. Maybe an armor ability or something..... but the little indicator above your teamate's heads already changes colors when they are being attacked, so you know to go help them
i had the idea of making grenades that created trait zones like we have seen in forge world. For example, you can throw a trait grenade at your teamates to give them an overshield or something