"Neither the synthesist nor his eidolon can be targeted separately"
So when you touch the Synthesist do you touch the eidolon or the summoner.
Eg. A synthesist is standing between an enemy cleric and a friendly cleric. The enemy cleric touches her with an Inflict Light Wounds. Then the friendly cleric touches her with a Cure Light Wounds. Does the Inflict touch the Eidolon and the Cure the Summoner? Or is the Summoner incased and therefore untouchable for better or worse?