Rex and Edward were locked in an intense stare-down.
Even though Lyra or the other Shapeshifters were not aware of who Edward was—they could tell that he had some history with Rex judging from how they interacted. It was easy to guess that they were once friends that now turned into enemies.
But then again, the sight was not surprising for Lyra.
It was a hint that Rex knew Edward well from how Rex warned her about him before the fight.
Now that she was seeing their interaction first-hand, it all made sense.
A lot of friends, brothers, sisters, or even lovers turned against each other in times of war, it was not a foreign sight for Lyra and the Shapeshifters who lived in the ancient era when the war was the most intense.
Some even consider it an inevitable occurrence at one point.
Just as they believed in this as the truth, Rex was also not an exception to this truth.