As soon as the story started I knew that both the professor and Glen were creepy as fuck.....

I’m actually suspecting glen being the delivery guy earlier. Plus... with that smirk at the end, he might be joseph’s Real stalker... well oof, just a guess thooo ;))

That might be true, I could not put a finger to why the delivery guy have blonde hair while the professor has black hair. And this might be the most possible situation as it will also explain why Glenn call at the exect time after shit gone down