Its shot having hit Jona, the bug openings its mouth a little, pleased to see its shot had landed on its mark, even it wasn't as lethal as it hoped it would be. During the time Jona feel and got to his feet, the bug pulled up the bolt lever, pushing it forwards then pulling it back again before sliding it back into its original place. With a new round loaded, the bug shouldered its rifle again, but couldn't aim well, needing to fiddle with the rifle's grip again, this requiring it to move back when Jona began chucking the fireballs about. One fireball flew by relatively close by its head, the glare of the fire dazing it a little, but not to an incapacitating extend.
Shaking its head as it moved back, the bug considdered backing away and leaving Jona to bleed to death, but decided against it, figuring Jona might try to cautherise the wound to safe his life. No, it would finish what it started. Unable to really aim with it rifle while there was a chance of a fireball raining down on it, the bug moved towards the edge of the roottop again, avoiding the place it saw a fireball falling towards, its throat vibrating lightly upon reaching it. Then, the bug opened its mouth and from it, squirted the irradiated liquid at Jona, aimed at his hand and arm of his throwning arm.
In case the liquid was vapourised, it would create the hazzard of irradiated vapours in the air.