And a millisecond later he wasn't thinking it was such a good idea, because it's hard to think after being punched by a Tau battlesuit and having been effectively squished into a tank hatch like jam into a jar.
Fluff-wise bolters fired from too close for the explosive to arm still punches straight through Astartes armor, through the Marine and out the otherside and keeps going. I'm pretty sure that is sufficient penetration, especially when combined with the extreme rate of fire of a storm bolter.
On the other hand. If I were that guy, I would have made sure the power pack for my laspistol was overcharged for a hotshot. Not enough in this case, but still.
But ok, let's say it could achieve something if he fired that storm bolter at it, he still doesn't have enough time to turn it around and get off a good salvo before he's reduced to the likeness of minced meat.
That would depend on if he even managed to fire it anymore, not to mention if it would hit somewhere so it would not just go into interior machinery rather than the pilot. Oh and if the Crisis Suit has a shield generator, then that too.