Depending on where the Goldfish's "bobble" movement has taken it, it is sometimes possible to reach it without shooting it. However, shooting it shouldn't worry the bridge soldiers - unless maybe they were hit by a ricochet... If they turned hostile while you were fighting the Avengers attacking Sepator, one might have been hit by a stray bullet.
It helps to keep them non-hostile for later in the game, so it might be worth replaying that section. Alternatively you could try the ESC-F menu to improve their 'attitude'.
The error message doesn't tell me much, but others here are better than me at interpreting game errors. Does the DV crash happen when you are leaving DV or at some other time? There is a known bug that crashes the game whenever you use a transition out of the DV map. Fortunately the Autosave usually works.