Headscratchers / Green Lantern: Beware My Power

• Why did J'onn J'onzz immediately declare John Stewart, an intruder upon him entering the Watchtower? Why didn't he just read his mind or ask who he was and, what he was there for before having the other Leaguers attack?
  • Because he's somewhere he isn't supposed to be and is thus intruding. An initially peaceful approach is thrown out because they're in space and most people can't bumble into a space station by accident. It's safe to assume that he is a potential threat.
• Is it explained how Ganthet got Hal's ring and why he was looking for John specifically?

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