[isabelle] Enter MATCH


I've just stated my theorem, typed "apply(induct rule: ...)" and then typed "apply(auto)" to see what Isabelle could manage on its own. All that happened was that my output window turned a strange blue colour, Isabelle said "Enter MATCH" and proceeded to output lots of random variable names. What's going on? And more importantly, what should I do to stop this happening? 


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