One of the reasons for using Filas is because it is in their nature to hold rather than maul -- as long as you don't fight back and stay still. That's a large part of the reason they were used to track down runaway slaves in the bad old days . . . they could track, were fast enough to catch, and didn't damage the slaves unnecessarily when they did catch. Unpleasant to consider, but a lot of history is like that.