Olag was starting to think about the grave mistake he might have just made. Coming in and assuming he was the great hope that Amir had in his mind, strong enough to defeat Murkel.
As for the second thought, it was after realizing who it might be. For a second, Olag had in the back of his mind that he wanted to test this person. After seeing a few moves he made, he wanted to see more until he felt like everyone was trapped in a corner.
For him to fail to see the plan in the attack beforehand, to get them into the position they were in, there was only one way someone could do that, and it was if they were overwhelmingly powerful compared to their opponents.
The strange dark floating substance around the white-haired man's arm was sending chills running down Olag's spine. It wasn't his human senses that were reacting either; it felt like the beast part of him.