Performing covert actions was never easy, and it was especially difficult for a scheming anglerfish. He was having a hard time here!
Nevertheless, it was best to be covert given the circumstances that they were in. Since a massive wyrm risked its own neck to keep Timothy, and his team away from the ruins, it was easy to put two and two together, and take the wyrm's warning seriously!
It was absolutely stupid to attack the dark mages here directly, not unless the team knew what they were dealing with, and this was what brought Timothy here. He came alone, and as for everyone else, he created a temporary den where his team, and the platoon could hide in, as they didn't have to tag along! They were half-a-kilometer away from the ruins, and they were absolutely safe.