Today I tested the Failsafe mode a few times. I'll leave the description as of how one turns it on and how and when it can be interrupted (and how); I want to just report on how it works: At first, once it kicks in, it does wait 3 seconds. Second; it turns it's nose towards you; and starts flying rather quickly towards where you took off (or where your HL location is saved at). This happens at a quite fast; safe speed. It's GREAT! Third, it stands above where you took off and waits; then starts descending, which does happen rather slower. I suggest that at this point one interrupts the sequence and lands it manually, thus faster. And that's it!