It would have been nice to have Vader face him while picking him up in a choke hold (ala Captain Thingy of the Tantive) and dangle him off the edge, it would have made it a bit more up front and personal.
Alternatively he could have just shoved him like when Michael Caine pushed Alf Roberts off the Car Park in Get Carter.
"You're a powerful Sith Lord but you're out of shape!"