Erich immediately hogtied the sage once he had stunned the man, before throwing him over his shoulder. The fugitive could not even scream at Erich because he had bound the man's mouth with rope. This was a measure done to ensure that the prisoner did not attempt suicide by bitting off his tongue.
After all, Erich had gone to great lengths to secure this prisoner, and the last thing he wanted was for the bastard to end his own life before he could be properly interrogated. Thus, Erich carried the man off, as he ascended the mountain to get back to his comrades who were providing overwatch for him.
Naturally, they did not expect to get into a battle with armed hostiles, but one could never be too careful when you were in a strange and foreign world. Once Erich had climbed back to his comrades, they noticed something peculiar. A storm had begun to rage, and it was quite a nasty one.