PROFILE > App > Mystery App
ENTER TASK NAME: "Freeze Facebook"
A1. Stop Task "Un-Freeze Facebook"
A2. Run Shell pm disable com.facebook.katana
EXIT TASK NAME: "Un-Freeze Facebook"
A1. Wait 30 Seconds
A2. Run Shell pm enable com.facebook.katana
Then in the Profiles Tab, long click on the Profile itself, click Settings (little slider icon that pops up) and scroll down. UN-check "Enforce Task Order".
This will make sure that while the 30 second timer is running, when you re-enter the Mystery App the Enter Task will run again immediately, stopping the timer.