I have seen a Devastator's projectiles explode immediately upon being fired, causing splash damage to the Devastator that fired the projectile.
I believe I've only seen this happen in Besiege mode, where the point in space from which the projectile launches seems to be lower.
This caused great consternation when, seeing my Devastators losing health and seeing explosions going off all around them, I searched in vain for some sneaky bomber balloons or warlocks that I'd missed, but found no enemies in range.
I saw this in 1.0.33.
