[RMVX ACE] [EVENTING] PARALELL PROCESS LOOP

So I want to run a paralell process event once and once only, as soon as a variable condition is met. But it keeps looping once the evnt is finished. Heres what I have;

Conditional Branch: Self switch B = Off
Conditional Branch: Var X = 18
Event
Self Switch B = ON
Exit Event Processing
Else;
Else;