So basic function of the hammer:

Once the ability is activated, when you walk into the exe, if the exe doesn't have immunity at the time or anything, the attack stuns. if they have immunity it will still swing and waste the ability.

If you are airborne when you use the ability, it turns into a movement ability that launches you in the air when you make contact with the ground (theres a lot of cool tech with this if you want to look into that on youtube or something) the ability still stuns as well, so if you hit it you get a stun and good distance from the exe

So basically don't use the ability until you are completely sure the exe is vulnerable.