I’m not sure, what are we actually overwatching?

I'm not sure about what we are actually overwatching....

Well, I suppose we are overwatching the fire, aren’t we?

The only thing I knew before this request about Overwatch was the Tracer pose mess so, so thanks to my OCR friends for explaining me its lore.

What was playing:
Santiano
“Great Song of Indiference”