Important lessons to learn
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There are two big lessons to learn from this:
1) Goggles limit your peripheral vision. That guy went unnoticed because he was hiding below the field of vision of those entering the room. When wearing anything that affects your field of vision, you must actively scan the area.
This is a lesson I learned a long time ago working in industry wearing PPE. It's very easy to forget your vision is impared and bonk your head on things.
This is especially important for all those Gun Culture 3.0 guys running around with NODs to remember. Typical NODs only have a 40° field of vision. Even the best quad-tube NODs are 97° in the horizontal and 20° vertical.
2) If you are going to clear a room, you have to know how to do it. The proper way to do this is slicing the pie.

When I went to Thunder Ranch, one thing we were shown to take a quick peek at the danger zone.
Yes, you are telling the person there you are coming. But you will also know they are there and are not caught by surprise.
Using both poor technique and not accounting g for your restricted field of view is what gets you shot in the dick without seeing it coming.
Lastly, these best way to clear this corner is...
