Awesomely Awesome CoFA Pic (Spoilery?)

Cassie Clare retweeted this pic, based on a little tidbit from City of Fallen Angels. Reference to this subject has been classified a spoiler by Cassandra Clare, so continue at your own risk.
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Picture found here: http://thelittleshadowhuntersthings.tumblr.com/ (Awesome tumblr. Has a TON of Mortal Instruments and Infernal Devices pics like the one above)