Lotor was sent to investigate one of the planets that was meant to be invaded and under the great Galra Empire by now but when he stepped out of his ship all he saw was… destroyed Galra cruisers, fighters, sentries, and Galra etc. And in the mist of that destruction was you destroying the last sentry. When you were done you collapsed. Did you do all of this..? Did you save the planet all by yourself? He made the assumption you did and he started thinking of what do now.