John, Bobby and Rogue became fairly close friends, with a "fire and ice" rivalry existing between the boys. John's literal hot-headeness got him into trouble with Professor X when he made a human teen's cigarette explode in a public museum. John was further disillusioned with humanity and the X-Men's credo after Bobby's brother called the police on them. Rather than submit to arrest, he attacked the Boston police with giant fireballs, blowing up a few squad cars. This resentment led John to leave the X-Jet and join Magneto and Mystique as they leave Alkali Lake in a Chinook helicopter. Taking the name "Pyro," John apparently has chosen the life of a terrorist.
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