Big guy - came up in Insights knife class. Instructor was a little guy. Student was big guy who said he didn't have much to worry about.
Teacher, with training knife, came close and 'stabbed' him in the stomach several times in a second or two. Said you can run into little crazy guys.
I worked on a case where a big guy got into an argument with a little old man. The latter took a paring knife (like to peel an apple) and stuck it into big guy's chest. Big guy was hit a magic spot and dropped stone cold dead. Little old man was on drugs.
8 is enough unless you run into 101 Dalmatians or 11 wild African Dogs.