It COULD happen... but... it'd be hard. Not impossible but improbable.
Even if you are bunkered up and under cover, and your opponent comes charging around - you'd have to be on your way to a side popshot or sprint to another bunker. He'd have to be rounding the bunker just as you were springing out and you would BOTH have to be posturing your gun at the right angles...
it just seems so improbable.
But... 6,000,000 people play speedball. Sooo...
It could happen. I had someone spring around my bunker on the last night game I played. He put a shot into my left hand/wrist hinge from about 2 feet away (OUCH!), and I put two into his abdomen (DOUBLE OUCH!) but there was nothing even close to a barrel tap.