And the kicking action of Dangerfield was in the same direction as the sling so part of the "force" was contributed by Dangerfield. This was proven by the expert witness and makes sense. So the force may appear excessive but it can't be totally attributed to Trengove, hence the force applied by Trengove could not be excessive (whatever excessive means). The attribution of excessive force to Trengove is patently unsafe. Hence the action should be redefined as accidental and therefore no penalty incurred
I rest me case m'Lud