I accidentally discover this in raid. Enemy Phileas Fogg fire on my Kara when my both Ludwu\ig and Kara have taunt. Enemy Phileas Fogg dispell my Kara but my Kara doesn’t receive any damage or def down against green ailment. (I know Kara immune to any def down but her passive doesn’t active.)
This happen because taunt protect any ally that doesn’t have taunt. Since Phileas Fogg dispell before deal damage, when enemy Phileas Fogg dispell my Kara, Ludwig’s taunt protect my Kara against Phileas Fogg’s direct damage and ailment. So, my Kara doesn’t receive any damage or ailment at all. This work actually as intented when base on taunt mechanism. Really interesting mechanism .