It's a small moment but one that I Really like as it fills a long running issue that I, and many others, have had with the series. Why is it during a Lightsaber duel the combatants are always aiming for the lightsaber instead of their opponent? This has been a issue that been bugging me for YEARS and with one small line of dialogue Rebels fixes this issue. Given that weapons in Star Wars like lightsabers and blasters are almost certainly plasma based that means that there is a magnet nature to them, when he when blaster fire or a lightsabers strike one another they don't pass through one another like they would if they were actual light.
And that line from Kanan seems to confirm this and explains why Jedi and Sith fight the way they do. They aren't aiming for the blades, blades are being pulled towards one another and the Force users are trying to work around that. Again, it's a small moment but one that I truly do like for the world building and plot hole fixing it does.
