Mac2 realised Mark was quite unsettled coming here, into the unknown, and it was aware that there was 'stuff' surrounding that Beth girl. Its task in this first session on Cypriot soil at Mark's new home was to take charge once again and help settle the young man. Mac2's only interest was its own survival. For the moment, Mark provided the best opportunity for that.
When that Duncan fellow had left, Mac2 would start increasing its level of control of Mark. In the meantime, Mac2 wouldn't modify the contents and functioning of Mark's brain much, lest Duncan smelt a rat.