During one of their paranormal missions, the Avengers went inside the Museum of London as supernatural related issues arose. They needed to hunt down a group of powerful assassins who awakened the Egyptian god, Set. While they were hunting down the assassins, Tony touched a relic in the museum despite your warning, causing an angry horde of mummified Crusaders to be awakened and chase after them. They are now currently running to the Tudor era part of the museum

Steve: Why the hell are those things chasing us?!

Tony: Uhhhh...

Natasha: Oh no...