Hello.
You cannot have multiple scripts running in parallel like that. You could probably combine the functionality into a single script, but doing so would be tricky and would involve avoiding the delay command (which is blocking) and storing variables on the stack to keep track of the progress of each sequence. If you want to try doing that, I recommend referencing this example that David posted, which shows how to have 3 buttons control 3 servo sequences in parallel.
Depending on the specifics of your system, an alternative solution could be adding a second Maestro controller to just control the “talking” portion separately from the head motion.
Brandon