Not having 12 current projects running, doesn't have 10 years experience with node.js. no masters degree, doesn't have 5+ years working as a senior developer. Nah, he can't have this internship.

Joking aside, if you can't talk so well, you should look into taking a public speaking course like toastmasters

Where do you get this from?

Maybe help them out by writing down a pseudo code algorithm with them so they know what steps to take. It would be easier to code if they learn how to break a problem down verbally/visually into smaller steps