Look at this freighting video of QVC co-host Cassie Slane appears to be having a medical emergency LIVE on the air! It appears serious but sources are now saying she stable and tweeting about her incident.  The weirdest thing is that she has passed out live on air before! Back in 2010, Cassie "fainted" during an electronic segment. I've never passed out on the air before, but I did fall asleep once! Well, that's a story for another day!