Originally posted by Mad Bomber
There are no other canon incidences of ships being pursued into or out of subspace in the same way as the Lucifer.
Actually, that may not be entirely true. Yes, tracking cap ships through a node like the Lucifer hunt was a new thing, but battles in subspace may not have been unique at all. Read:
sm3-07a.fsm
From the records you retrieved in Altair, we have discovered the means to destroy the Lucifer. As you know, our shield systems do not work in subspace. The same holds true for the Lucifer. More importantly, the records contain the information to enable us to track a capital ship into and inside subspace.
The highlighted part in important. Why would the pilots of fighters know that the shields don't work in subspace unless they had a reason to use it. Chasing ships through the node may never have been done before, but battles in subspace do appear to have happened. Or at the very least, they either expected that it would happen or planned for such an event. In any case, it was researched enough that even the pilots were informed of this fact.
It may be that the Lucifer's death throes (rather than its technology) allowed such an interaction with the subspace tunnel that the GTA fighters (and the exchanged Thoth wing) could exit through the same vortex.
Several ideas come up here. 1) All intersystem jumps end at a specific location. It's just something they do, part of normal operations.
2) What you said, the release of massive energy made the jump vortex out large enough for even the fighters to escape.
3) Might be normal for exiting ships in subspace to produce such a large opening that anything can go through. Would certainly make node assualts easier, that's for sure.
4) The vibrations necessary for a ship to exit might actually be transferable at extreamly close range. The fighters attacking the Lucifer were virtually right on top of it when it jumped out, and it may have transfered the exit vibrations during the sequence allowing everyone to get out.
Or something else. Just ideas, afterall.