I don't understand why this even is a question. As long as the round hasn't started yet, you should always be undamageable due to fall damage. I can think of this being an issue in Haven & Split, but I might be missing other maps where once...

Our cypher is back in the range and we've got 2 extra agents now! You need to play the recording by the computer near Cypher for Fade to show up behind Cypher. Brimstone's in the office underground. There's also an alarm bot near Cypher tha...