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Tracking your own energy helps detect inactivity damage kicking in. If the opponents energy drops 0.1, it could be due to inactivity or due to a 0.1 power bullet being fired. You can't be sure. But if your own energy drops 0.1 and you didn't shoot, it should be due to inactivity.

Not tracking inactivity damage results in a bunch of false 0.1 power waves being detected at end game. Usually not an issue, but having highly accurate wave detection is cool.