im curious about this statistic myself as there are few records of twin home birth...all of the stories i have read are positive, though i did hear of one that wasn't good. the midwife i assist was second midwife at a twin hb...first twin born fine, second twin had stable hearttones until cord prolapse, and by the time they'd reached the hospital, it was no longer alive...
very sad story.
the other stories ive heard have all been pretty textbook normal. some excess bleeding/borderline hemorrhage, one with a delayed second twin of nearly 24 hours!!
in any case, i think its good to know the possibility of something going awry and be ready for that.