Halting of ndb, when it download as --global

The error am facing when I download the ndb and install it in my machine (windows-10) as --global and change in my script file in package.json cmd, "debug": "ndb server.js", when I run this in the console it halting for longer period not showing anything, but when I download in --save-dev then I ran the cmd npm run dev it running successfully.

I wonder why is that, is anyone know this please let me know, I drop a pic do check that out.