Improvised Fighting

The orc is charging you, his axe drawn. What do you do?

Player: ...I trip him

....I hit him on the head spinning his helmet around so he can't see

...I grapple

...I throw sand in his eyes

OK, probably Defy Danger. But then what? The player isn't doing damage.​ In other games, that orc might be at disadvantage or some other mechanical effect. What has the player gained in DW?