Okay! Did some testing, and here's a few random tips on how and when this will work, and when it won't:
- Paranoid's hunch was correct, I've only been able to force it when the Luma was either directly next to a wall, or underside of the stage.
- The automatic Luma warp recalls the Luma to its standard untethered standby distance, while forcing the recall while it's near the wall and low enough will port it to its standard tethered distance.
- It requires a minimum horizontal distance away from Rosalina, which is a bit longer than the usual untethered standby distance. Being too close to it will cause Luma to die.
- Luma doesn't appear to be in any kind of stun, and can attack the moment appears. I was able to get magical teleport up smashes a few times, which could be fun in the extreme case where you can predict this happening.
- It always warps before the actual blastzone, and using any attack animation that causes it to fall below this line will cause it to die. ( I sometimes got it to port by recalling it, not exactly sure how it works ^^' )
- It seems for short distances, it's instantaneous, whereas longer distances, it has a speeding ball of light animation with a short travel time.
- If stuck under a classic FD styled stage ( flat on bottom, any slope will just cause it to go around ), the Luma will port through it after about 5-7 seconds of inactivity ( no attacking, movement is irrelevant ).
If there are any questions about how I worded things, or additional things you guys would like me to test, let me know. It's actually pretty fun learning about all these obscure mechanics. Anything that lets me get cheesy kills on For Glory is a welcome addition to my toolkit.