The shortcut app is a single thread. Send a message to an existing application (capable of receiving a message), wait for a response, send a message to the next application in the script and so on.

There's no logic, no timer.

The script is:

* Send message to {contact} with text (some templating done with location)

* Take video (Front)

* Save to photo album

The camera app has two messages you can send to it: take photo and take video. That's it.