Explanation below via Brian Clark Howard of National Geographic:

“The footage, posted this week by YouTube user gadhamasti, shows an unconscious monkey that was apparently shocked by wires at a busy train station in the industrial city of Kanpur in northern India. A male companion monkey is then seen apparently trying to revive his comrade.

The monkey bites and drags the limp animal and even douses it in water. After about 20 minutes, the injured monkey revives.”