I've tested this. Repeatedly. The Perseus wing will get through. Recall the Trebuchet has a five-klick range. Assuming that, as you say, the Ravana jumped in at short range, then it will be well within range. Turn towards the Ravana, lock, fire doubles. Wingman turns towards the Ravana, lock, fire doubles. Forward LReds down. Second pair (GTVA wings are normally four fighters so far as we can tell.) of Perseus fighters does the same for the SReds. Poof. SReds down.
Total time elapsed: not greater then ten seconds. Shivan fighter escort may or may not have actually engaged the GTVA interceptors yet, but probably not. If they have, they certainly haven't had time enough to kill them. Forward antifighter weaponry for the Ravana is nonexistant, and the Trebuchet in any case outranges any antifighter defense on any Shivan ship. Shivan bombers are just entering lock-on cycle if they were launched from the Ravana after exiting subspace, or if they arrived at the same time (which, recall, is something that generally does not happen) they're just launching their bombs, which can be intercepted before they impact.