Good movie. That is not the mercenary standing by the pool on the final scene in the movie. I believe it is the kid who shot the mercenary coming to kill the kid. We can't really tell.
Also, what is the deal with having to cross a bridge to get out of the city? FFS, take a small boat and cross the river at night. There is no way Bangladesh has Special Forces operators that are that good. Their military sucks. Also, no way an old broken down Bangladeshi Army Colonel with poor eyesight and a crappy rifle would be able to make those sniper shots.