Player deploys a grenade launcher which fires periodically in an arc. Player must position it so that it bombards the desired target area. Then the player can run off and the grenade launcher will continue shell that area.
There is enough time between shots that enemy players can run through target area. However, there is not enough time to plant a bomb or something. If the enemy team really wants to control that area, then they need to destroy the depoyable.
With all of the grenades in the game, I do think we need some kind of ability that can be used to block them, such as a force field. It doesn’t look like Turtles wall is high enough to stop many grenades.