Of course I wouldn't print what that keystroke is, but it is there, if you were at 500 feet and had to climb to avoid an aircraft that was descending this would be the way to do it. For those who have posted here and said above 500 feet is not possible, you need to take a look at some of the problem threads for people on RTH who have posted flight logs , that clearly show the drones above 700 feet and still climbing when the RTH was cancelled. This has been a common bug on the P4P and DJI are well aware of it.