The runner has datasucker in play with ample counters on it. The runner also has parasite hosted on a rezzed piece of ice - tollbooth.
When making a run on the server which tollbooth is protecting, the runner encounters tollbooth, and uses enough of the datasucker virus counters to reduce the strength of tollbooth to 0, thus trashing it because of parasite. Does the runner need to pay 3 credits for the effect of encountering tollbooth.
I understand this is another timing question, but there is a nuance with when the timing of datasucker is allowed. Does the runner first "encounter" tollbooth, and the only effect allowed to be resolved is tollbooth's? Or, immediately when enountering tollbooth, the runner may trigger datasucker as well?