Morten had become very impressed by the resourcefulness of his newfound allies. Silent for some time, he was deeply reflective over the Great Deku Tree's words. The motivations for war were stemmed in the acquisition of some artifact? There was nothing proud about this, although this thought alone likely demonstrated the naive nature Morten may have harbored about battle all this time. Ultimately, it seemed that his qualms about the longevity of the civil war were justified, and now here they were in the process of rescuing a friend of Will and Linora's. Whoever she was, she must have been one of much merit if they were going this far to save her. Another demonstration of the two's loyalty, Morten supposed, and admired.
Presently, Morten continues to ponder over the state of the plan as he follows the others. He is certainly surprised Will was able to get this Goron into the camp.