I think the compositing is vague enough here to support any interpretation as to where the lasers are coming from.
I agree. The Falcon fires only a handful of times in the whole battle and they’re all similar. In the opening TIE attack it seems to come from a central position. As they swing under the frigate there’s a shot from an extreme angle as it comes in from above, then another as it cuts to an interior cockpit view. BUT this is the weird one, because if you listen it sounds like a snub fighter blaster shot not the Falcon gun turret sound effect. Is it a front cannon or just an X-Wing off to the left? Then you have the part shown above as it takes out the Interceptor.
