Arjun sees that all the warriors are getting crushed by the teeth of Krishna's ๐๐๐จ๐๐ฌ๐๐ง๐ค๐ค๐ฅ๐๐ข . Krishna says that warriors are killed by ME and you are merely ๐ฃ๐๐ข๐๐ฉ๐ฉ๐-๐ข๐๐๐ฉ๐ง๐ (an instrument) (11.33) and hence fight without feeling distressed (11.34).
Incidentally, Krishna didn't ask Arjun to leave battle even though Arjun's enemies are already killed by HIM. Instead, HE tells him to fight without stress. The clear indication is that ๐ฃ๐๐ข๐๐ฉ๐ฉ๐-๐ข๐๐๐ฉ๐ง๐ doesn't mean inaction. Inaction is another suppression that builds internal stress. Even if Arjun leaves the battle physically, the war wouldn't have stopped and instead, he would have carried the burden of war mentally wherever he went. On the other hand, Krishna indicates to drop the burden mentally and perform the ๐ ๐๐ง๐ข๐ (action) in hand as an instrument of ๐๐๐ง๐๐ข๐๐ฉ๐ข๐ . This active acceptance is the best way to reduce our never ending stresses of day to day life.
For example, an electric wire conducts electricity to energise a bulb which gives light. The wire has two ways of thinking. One is that it gets filled with ahankaar as it is energising the bulb. Secondly, it can also think that it's just a ๐ฃ๐๐ข๐๐ฉ๐ฉ๐-๐ข๐๐๐ฉ๐ง๐ where electricity is generated by a turbine and the bulb is the one which is giving light. It is a fact that when there is a voltage difference, the wire doesn't have any option except to let electricity flow. Similarly, ๐๐ช๐ฃ๐๐จ , like voltage difference, are responsible for our actions, and the recognition that ๐๐ช๐ฃ๐๐จ are real ๐ ๐๐ง๐ฉ๐๐ (doer) is being ๐ฃ๐๐ข๐๐ฉ๐ฉ๐-๐ข๐๐๐ฉ๐ง๐ .
Instead of realising our status as ๐ฃ๐๐ข๐๐ฉ๐ฉ๐-๐ข๐๐๐ฉ๐ง๐ , our usual tendency is to make ๐๐๐ง๐๐ข๐๐ฉ๐ข๐ a ๐ฃ๐๐ข๐๐ฉ๐ฉ๐-๐ข๐๐๐ฉ๐ง๐ or an instrument that works for us to fulfill our desires. The key is to trust that we are one of the billions of instruments of this mighty existence.