Newb question, again. (Death from above- War skill)

Hey, I started yesterday and I'm doing pretty okay I guess but I was wondering about a specific skill that seem strange to me...

So yeah, what's up with the death from above skill infos:

''Attacks to prone opponents deal more damage.''

Do I read it wrong or is it a skill to make your opponent(s) stronger... ¬¬
What does it really do? is it good ?

prone opponet means an opponent not standing or knocked to the ground.
death from above combines well with barreling attack. An attack that knocks your opponet to the ground.

Alright, thanks. thread can be locked.. ^^