...well, if Pilar didn't Gate into Dispater's throne room from Cheliax - which Pilar obviously didn't, because you can't reach Dis except from Avernus - then, Pilar must have followed along with the Most High and Carissa Sevar without being aware of it.  But Dispater noticed, because Dispater said afterwards that He was wondering if Snack Service was going to interfere and if Snack Service thought it could evade His notice.

Pilar's ability has never felt like Teleportation to her, and yes, her walking places but nobody noticing, was the main theory she had in the back of her mind.  So far as Pilar knows, everything she's done could have been done by sneaking around without anybody noticing including herself.

Except for Tonia, who suddenly found herself outside of Project Lawful's Forbiddance while Pilar was inside a torture room.

How would that work?  Tonia sneaking outside and other people not remembering her?

...well, if Pilar didn't Gate into Dispater's throne room from Cheliax - which Pilar obviously didn't, because you can't reach Dis except from Avernus - then, Pilar must have followed along with the Most High and Carissa Sevar without being aware of it.  But Dispater noticed, because Dispater said afterwards that He was wondering if Snack Service was going to interfere and if Snack Service thought it could evade His notice.

Pilar's ability has never felt like Teleportation to her.  That she was walking places in an ordinary way, but nobody was noticing, was the main theory Pilar had in the back of her mind.  So far as Pilar knows, everything she's done could have been done by sneaking around without anybody noticing including herself.

Except for Tonia, who suddenly found herself outside of Project Lawful's Forbiddance while Pilar was inside a torture room.

How would that work?  Tonia sneaking outside and other people not remembering her?