Dear GM, pls. block these 2 multiboxing palyers (they even can cast spell on horse)

Dear GM,
In 14:50 to 14:55 ,2023-4-16, two palyers (1 warrior named Spinderift ,1 warlock named Absolutely ) are multiboxing at Stranglethorn Vale , they killed me ,I found that the warlock can cast spell on the horse , he followed the warrior and attack at the whole progress. He didn’t unmount at all , but can cast spell. Pls. block these 2 guys.
Thanks a lot!