How would I set up a Ticket workflow for when a Task workflow is completed?

Hello!

Here’s the scenario - we have a task assigned to a group, and when the task is completed, it’s supposed to go over to a different group. Basically what’s actually happening is that once the task is completed, the workflow stops. 

Here’s what I need - what is the best workflow to use to assign a ticket to a group once the task has been completed? There’s not a condition for “when task is completed”, so I’ve tried ticket type, status, etc. to no avail. 

Help, please!