Whoever said partisan cant kill reapers must be stupid anyways.
I did it in 94 seconds at Level 80 w/o Ice Marble Lin if I remember well (and I used skills for the purpose of being more stylish way of killing him, if I'd only comboed him I guess I would have been faster) and I did it with my Dragon Mage nearly this fast as well.
No reason to bump up an ages old thread though.