Originally Posted by
Blind Wedjat
Taskmaster doesn't need to have fought someone in order to learn their moves. He actually learns by watching them, and in the comics he's typically learned someone's fighting style by watching videos of them. So I doubt he's fought T'Challa or a Black Panther.
My guess is, he's somehow seen footage of the airport fight that happened during Civil War and that's how he's learned how to fight like T'Challa. He also mimics Cap's fighting style with the shield and Hawkeye's use of the bow and arrow, as well as Natasha's fighting style as seen in the trailer, and he may have learned these from watching the airport fight too.
Lastly, Nat beating Tasky in a fight if he's using BP's style doesn't mean much. Copying T'Challa doesn't give you his enhanced physical stats, his fighting experience or his tactical awareness. It's why despite memorising several fighting abilities he can still be beaten pretty easily.