He was in a mechanical suitany force lightning (which he was capable of) would have just redirected back at him
So the force in starwars is this magical spuritual thing. It should trandscend anything and I mean anything. The way they talk about it,the suit should be no problems. Again think about the way they talk about the force. Should anything really get in the way of that? I mean I know they had to have some sentimental moment; but again, the way the force is talked about nothing should affect it.
Luke, all but trained a month to be a Jedi; he's out there working Vader in fights. Vader has been in Jedi training since he was 10