Not that my opinion is much, but from what I saw, it was blocking, because where peter could use pipe to go to a secret roflol was using it either for that or for his own demise so he wouldn't lose points. as stated if u fail to activate it u get teleported to death and u die. By blocking it he don't give anyone else the chance to activate it, therefore it is blocking, also for personal gain. others would be raped where he won't lose anything by going in and be teleported.

PS, the excuse of waiting for activating by someone else doesn't count as he can do it himself without blocking anything.