I think in this case you can start different bpt and parent BPT will wait till then.
UserPicksAnAction is a parent process here. It will not close and according to condition supervisor review on initial review. Then from supervisor review/initial review will return the final result after processing and according to returned result UserPicksAnAction will get process either complete or execute any other condition as per your requirement.
By this way UserPicksAnAction will not complete an if super admin takes any action he can take.
regards