The man police believe to be responsible for two Brooklyn subway station slashings roughly 15 minutes apart had a rather ominous warning to transit riders after he was arrested and charged. Patric Anderson is accused of slashing a woman in the face and chin at the Atlantic Avenue Barclays Center stop late Monday night, according to police. In that case, the 38-year-old victim was slashed once in the chin on the 2/3 platform. Just 15 minutes later, a 67-year-old man was gashed in a come-from-behind attack on a staircase at Fulton Street on the G line, police said.