Imagine a camera flying through, back the way Heather entered.

Transcript:

Panel 1: Heather and Shen stand up. Shen has his arm behind Heather’s shoulder, propping him up.

Agent Shen: Something’s been changed!

Panel 2:

Agent Shen (shouting): Where did they go!?

Panel 3: Heather looks forward.

Heather: Through the portal…

Panel 4: View of an octagonal corridor as steps are traced backward.

Panel 5: Alerts pop up on a monitor.

Panel 6:

Display on Screen: ALERT: COLLAPSE COMPLETE