How Can I Check 'Can Character Step Up On' When Montage is playing(ue4)

Hi! Please Help Me.

I wanna check ‘Can Character Step Up On’ When Animation Montage is playing .

My problem is my boss character step up on player character’s collision during his jump-down animation.

I also check ‘Can Character Step Up On’ is No.

After the animation boss get down, but before the animation It still step up on player character.

I hope step on the character during landing, I hope it comes down.

What should I do?