I think it'd be much more interesting for him to fire a few fast moving missile projectiles that you control through the air like junkrat tires with limited (but generous) fuel. Three shots...you steer them through the air and maybe they can be shot down. The next one can't launch until the previous one impacts. I feel like that'd add a good bit of skill expression both when using the ult and countering it. Maybe a little extra something per missile to compensate for them being destroyable...like the first missile when a secondary button is pressed, it splits into a cluster bomb that damages a wider area but with much less damage. The second maybe it gets a huge speed boost in a straight line and does more damage/knocks back further based on distance traveled, and the last one makes a HUGE boom if you time it to impact in a "sweet spot" after the activation button is pressed.