How do I make player attack while in air

So I want my player to be able to do a separate attack with a separate animation if they are in the air.

Example...

If player is in the air perform ground slam attack.

Can someone please help I will pay for a video showing how to do this.

it would look something like this. this will make you descend at 2x the normal rate.

on spacebar pressed

subevent: player is on floor >>> normal attack animation

else >>> set vector y to player.platform.maxfallspeed*2, set animation to "falling swing"

on landed

is playing "falling swing" >>> set animation "smash"

note: gravity should be set to half of maxfallspeed for this example, and jump strength should be adjusted for the gravity.