If mobs arent within melee range of target itll likely miss them. Not much to it honestly. Dont really see a reason to see its area since we cant really aim. Thats like asking for an AoE marker for RoD or Quick Knock... doesnt really make sense since its fully dependent on your targets position. Maybe a "hold" kind of thing where holding down the LB shortcut shows the AoE marker so mobs can be placed better before releasing and have it go off.

I have been wondering if it can miss. I used it one time and the boss moved to the other side before it fired. Teamate said it missed, but I swear I saw the big number hit.