Kenobi giving a Qui-Gon Jinn a highly contested sparring match is better than anything Malgus had done at that point, given Jinn's status as one of the most skilled swordsmen the Jedi have ever produced (Star Wars Encyclopedia). Malgus might win through lightning/TK although I can't remember any extremely impressive Force showings from him at that time, so I'd side with Kenobi.