Running prism within a powershell script

[mhpkmd]

I'm building a powershell script that should start prism mock instance, and then execute postman collection tests against that host using newman in same powershell script.
The problem is when the script reach 'npx prism mock https://raw.githack.com/OAI/OpenAPI-Specification/master/examples/v3.0/petstore-expanded.yaml' then the process stop within this service, and will not continue executing the newman cli part of the script.

Any ideas how I can start prism "silently" while still being able to exit that instance running in the end of the powershell script?