HI GUYS, I HAVE A QUESTION ABOUT MY BROADHEADS I SHOOT THE SHOCKWAVE MECHANICAL HEAD, A COUPLE OF YEARS AGO I SHOT A NICE 7 POINT BUCK WITH THIS HEAD THE SHOT WAS A LITTLE FAR BACK, BUT THE BUCK ONLY RAN 30 YARDS AND DIED, BUT WHAT GETS ME IS THERE WAS NOT A SINGLE DROP OF BLOOD ANYWHERE AT ALL , NOW THIS YEAR 2 WEEKS AGO I SHOT A DOE RIGHT BEHIND THE SHOULDER TOOK OUT ONE LUNG EXITED THROUGH THE GUTS AND ONLY RAN 40 YARDS, BUT NOT A SINLE DROP OF BLOOD ANYWHERE HERE EITHER AT ALL, NOW WHY DO YOU THINK THIS IS I AM OPEN TO ANY SUGGESTIONS, ALSO BOTH SHOTS WERE COMPLETE PASS THROUGHS. THANK YOU