To me it seems obvious that the result of shooting the tires of a locked bike should be the same as on a unlocked bike.
And the reason that you get thrown off the bike would be so that you can't steal it. That's how a lock on a bike works, not some kind of armour.
These above stated facts should show pretty clear that this incident can be seen in two different ways. I honestly didn't know this was script abuse, but sure I can adapt to it if that's so.