Inside Arthur's throne room, the group was getting ready to move out when the message was heard on Leo's mask. It was heard by everyone in the room since they had enhanced hearing and that included the likes of the second leader.
"Oh, it looks like your little family might be in trouble and needs your help. Although, I believe we had an agreement first." Tempus said. "Don't tell me you're planning to leave after getting that message?"
Too many things were happening at once for Leo to make an accurate decision on the spot. For one, there were those in the castle, and now he could see that they were moving the bodies, placing them on some strange device in the library.