There has been a running debate for some time on an archery forum with one rather simple question going unresolved. Here are the opposing arguments. Can anyone shed light on which is most accurate? Argument 1. Animal tissue must be modeled after a fluid for the purposes of terminal ballistics because it is, by content, mostly water and water is a fluid. Argument 2. Animal tissue must be modeled after a solid for the purposes of terminal ballistics because, regardless of moisture/water content, it is not a fluid environment and moisture content is not one of the defining characteristics of fluid.