Actually there's another epic tale in *Cough* Tales where a super-cyborg bounty hunter shows up to try taking down Vader (revenge for a past killing) and is VERY well-prepared for it. Pulls out all kinds of nasty tricks that keep Vader reeling...for a little bit.
No EMP, but definitely a good showing of someone doing their homework and approaching the fight with a Jedi in a cunning and intelligent manner.