Follow what the placards..ok you have never evacuated a plane..I have.You have to asses the situation which they did and realized some doors could not be opened

Follow what the placards..ok you have never evacuated a plane..I have.You have to asses the situation which they did and realized some doors could not be opened so had to divert passengers to other doors..if you read it the PA system went down and they used megaphones to direct people