In Super Smash Brothers Mêlée, it's possible to tech on the side of the stage against powerful, edge-guarding attacks, such as a Spacie's down-smash, by inputting a tech pre-emptively. This is called (l)edge-teching. If an edge-teching Spacie immediately does a side-B (phantasm or illusion) after the tech, they can grab the ledge safely because of its speed.
As a Falco player, it is common to edge-tech against my edge-guarding Dair. I've seen another Falco player edge-guard by doing a Dair into ledge-cancel into Bair to counter edge-tech phantasm/illusion. This probably comes out at such speed that it's impossible to edge-tech the second hit. I've tried to do this, but the spacing and timing is strict. What are the other options to deal with edge-tech phantasm/illusion?