Not so much a bug. The hammer is pretty powerful with the jetpack at this point. Of course it's subject to refinement, but the distance on that decapitation was what made me make it into a gif. ;-)
from what I see in the first gif, there's at least a little delay in the hammer once the swing is over... and it's actually easier to swing a war-hammer fast than it is slow because centripetal force. I think
