/// <summary>
/// Returns all other fighters within sight.
/// </summary>
public static IEnumerable <IFighterStats> GetVisibleFightersFor(this IEnumerable <IFighterStats> fighters, IFighterStats fighter, EngineCalculationValues calculationValues)
{
return(fighters
.Where(o => o.HealthRemaining(calculationValues) > 0)
.Where(o => o.Id != fighter.Id && o.GetDistance(fighter) <= fighter.VisualRange(calculationValues)));
}