History
Avalanche helped Mystique trick the Exiles into helping them reunite the Brotherhood by causing a fissure underneath the train the Exiles appeared next to. The train derailed, and Mystique blew it open, causing a gas to leak out and stint Mimic and Sasquatch's senses of smell. Mystique blamed the gas for her inability to teleport when she was pretending to be Blink as well.[citation needed]