You could (and probably should, if possible) also fit in at least one instance of the Resistance realizing that the weapon is about to fire again, which would at least imply that the good guys know what’s up (which would help with the chipper attitude). Either way, as Neverar said, if we think that the base can fire any number of times then we know that it needs to be stopped ASAP (and the simple fact that the X-Wings continue their attack could be enough to acknowledge that they know this).

I guess the issue is just how do you get this idea across but I’m sure there’s a way (perhaps what Neverar suggested^) and otherwise I don’t think restructuring the sequence would be that intensive.