Question, How does Mimir see what's infront of Kratos, but he's hanging from behind?

I couldn't find any info on this, not even the GOW Wiki.

E: Thank you all for your answers, I appreciate it. I guess the 3 answers I could take fromcthis are: Magic, Bifrost eyes grant him 360° Vision or just the knowledge he has makes him know what kratos is doing at all times