How do make a lunge not go in the air with a sword?

I'm Talking when you lunge in a sword game and you jump in the air I want to stop it so you won't jump when you lunge/

Heres my script

    force = Instance.new("BodyVelocity")
force.velocity = Vector3.new(0,10,0) --Tool.Parent.Torso.CFrame.lookVector * 80
force.Parent = Tool.Parent.Torso
wait(.5)
swordOut()
wait(.5)
force.Parent = nil
wait(.5)