The one thing I don't like about this game is the cost of takedowns on your energy bar. It doesn't really fit that I can render my body invisible and use electromagnetic forcefields to jump from rooftops for negligible cost but a simple punch to the chops wipes a battery out in one go. I think a much better solution would have been to have them cost about 80-90% of a cell, meaning that if you use a lot of, say, cloak or silence to get in to position, then it takes off the rest of the bar but a plain old sneaky sleeper hold recharges - though it would leave you exposed briefly if you wanted to conserve energy.