NEW : `` No deal 's worth that , '' one witness shopper says of pepper spraying . L.A. police seek woman suspect in Walmart incident . Psychologist says Black Friday tactics make shoppers frenzied . TL;DR
NEW : `` No deal 's worth that , '' one witness shopper says of pepper spraying . L.A. police seek woman suspect in Walmart incident . Psychologist says Black Friday tactics make shoppers frenzied . Incidents mar Black Friday shopping in at least seven states .