shooting him at least twice. they ve done their homework on this pope s patterns and observed how the swiss guards have protected him. they watch very closely all of his appearances around the world. how he interacts with the crowds. reporter: widmer and secret service agents say there will be agents blending in, watching for strange body language and facial gestures. the popemobile is armored although much is open air leaving him exposed. d does the pope wear a bulletproof vest? they would not wear it on in an interior site but most likely at an outside venue. reporter: we asked widmer as a guard can you tell a pope who likes to go off script to hold back? no, you don t. and you try to work with the pope and see what he wants to do, and then adapt and provide the best security that there is. the security is not what leads the pope. it s the pope that leads the security. the pope is doing his ministry