It's a flashbang... to all kids: recruits aren't the main army, so don't call the army "noobs". I bet more than half their army can pull you up with one hand.
not sure what the soldier who throws the granade says, but it sounds as the other solider says "hoppa hoppa" and in swedish thats "jump jump", just cant figure out if what he screams is swedish to.
This video might be hard to watch, a soldier doing some routine training exercises is ambushed out of nowhere from behind. I'll pray for his children ...