>> completely brainwashed. i've never in my life met people like this. >> this, of course, is the mosul isis officials wanted todenhofer to see. they gave him written permission to come to the city and he believes they let him leave alive to make a point. >> they wanted to show me that they are a state and this state is working. it's not a perfect state, it's not like the united states. but it's a state. >> and it's getting bigger. todenhofer saw new recruits pouring in every day. >> in this recruitment center we had every day more than 50 new fighters. they can lose fighters. they don't care. the amazing thing is that they are completely enthusiastic.