If we'd known you were fighting him, Dad and I would have come and helped you.

[Although the idea of helping a friend really goes without saying, Bulla's mildly surprised at herself when she realizes she would actually fight instead of leaving it all to her father.]

...assuming it happened before the thing with the cultists. I wasn't in any condition to help anyone after that.

[On the plus side, she'd protected him, and he'd unleashed some super-Saiyan whupass on the cultists.]