Sathar hypnotizing PCs

Wonder how to go about this? Two options are suggested in the AD book: 1 the player thinks the sathar is now their friend which pretty much means the PC is now a NPC in my book. 2 that they are given a command to perform and ordered to forget it till the time its done. I like option 2. For instance if the Pcs encountered a sathar and was hypnotized and ordered to go on the Volturnus Survey Expedition and seek out the obelisk and activate its beacon to summon the sathar battle feet. This could be a good tie in and it advances the story. Later on star law is investigating how the obelisk sent the signal and the PCs must spin it as the pirates did it.