i am stuck on mission Curtains Down

[biruk]

hi to all

when I played mission Curtains down. first I do swith a fake gun with a real gun and plant a bomb on the top of the chandelier after that i go to the hall wait about 15 minutes but actor came and go nothing happen. did I wait another minutes or what?
thanks
soory about my english lunguage

[crazyhorse128]

do everything you just did, but dont blow uo the chandilear untill the American guy runs down there, when he's under the chandilear detonate the bomb