Pretty sure that was just the catalyst dissipating since that same light was shown when the catalyst was given to Hiro.
Overall I think I liked the episode... I don't like how they didn't explain what the hell is up with the catalyst. Did they even explain why Claire wanted it out of herself so badly? Claire losing it and Hiro gaining it seemed to have no effect on either, so the whole thing seemed pointless to me.
Personally, I wish they'd work on improving other characters instead of running around nerfing everyone. I'm going to have a really hard time with Nathan as a villain... really don't like the character.
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