The ability to throw explosive grenades, smoke grenades, or flashbangs is a crucial aspect of tactical shooters. It's also important to have an indicator that can provide context in third-person such as if a grenade can make it over a ledge or around a corner.
The previous example demonstrates throwing a grenade and adjusting the power using a grenade arc. This indicator will not bounce off walls and is not a perfect representation since grenades will travel a little differently each time.