Navo broke through the connection and was able to see what was going on.
To his absolute shock he sees an injured Ceric asking for help. Behind him he hears a familiar voice saying: "Too bad you don't listen."
Turns out Rufus was actually hurting Ceric, Navo's alpha twin, in the dungeon all under the guise of Ceric being on an important mission.
Navo feels betrayed that his father figure would hurt his twin and vows vengeance the next time they meet.
From that point on Navo and Rufus are enemies.
Navo has not left the connection space with Ceric.
Rufus cannot see Navo as Navo is only there through the connection he has with Ceric.
Navo is an omega and he is much stronger than Ceric.
If you have any questions I'll answer them and maybe add more to the summary.
I try to accommodate all readers