In short, Im raiding a drone base with my sons. We place explosive devices on a door or turret. After several beeps the explosives just disappear. There needs to be some indication that tells the player that there are shields blocking the damage. A visual and sound indication of some sort would be nice. The way that it is right now feels totally glitchy. Someone who doesn't know about shields wouldnt have a clue and assume the game is bugged.
