What did Marquez Do? crash? not sure he did it on purpose, He said he didn't see the yellow flags, there is no reason for a Motogp rider to ignore a flag during a warm up round, so I will give him the benefit of the doubt.
Obviously he didn't crash on purpose, but the flags are there for a reason, and not paying attention isn't a very good excuse. This isn't the first time this has happened to Marquez either, with negative consequences.