Bernice & Clive Mission Question

[OneMug]

Follow on to my previous question about Merc Log.

There was a little hitch in the Bernice/Clive mission. It was hinted that I didn't need to resort to force to resolve it. My solution was to give the weapon to Bernice and have everyone sprint to the sector exit point. The father's assistant (& guard of Bernice) took a shot at Warlock, who ran out the back door. He missed and Warlock was out of sight. Then Cameron and Bernice sprinted past the assistant and, before he was able to acquire either as a target and get off another shot, they were out of the building and ran to the sector exit point. We travelled to Campecino and the only dialogue choice I had with Clive was that I had to shoot someone to get Bernice out. Clive was not happy. My squad didn't fire a shot! So,

How was I supposed to get Bernice out with no one firing a shot? Little help?
OneMug
P.S. Is there somewhere a mission walkthrough? I like to do missions on my own first, then sometimes look at a walkthrough to see what I missed. Then I decide if I want to go to the trouble of replaying the mission. Mostly no, unless I missed something really important!