from my favorite website:
Expert Testimony on Multiple Attackers
Dr Lalli and Dr Liviero testified that "the nature of the bruises and multiple wounds caused by several different methods -- suffocation, strangulation and stabbing -- led them to deduce Kercher was attacked by more than one person.[6] Dr Liviero stated "There were more hands involved"[7] which is basically what it comes down to. Rudy as a single attacker does not have sufficent hands to do all the required tasks. A single attacker needs one hand to wield the knife which just leaves a single hand to restrain Meredith and there is no way to restrain someone who is upright with just one hand. The cuts from both sides is also very difficult to explain with a single attacker.
Two defence experts testified that they saw no evidence that more than one attacker was involved although both these experts declined to examine the victim's body.[8] Declining to examine the body and instead working from pictures is a strategy that defence experts use to give them more room to interpret evidence in a favourable light to the defence without actually lying.[9] There is no other reason to work from pictures rather than from examining the body. The defence experts also disagreed on how the murder happened. Dr. Introna testified that the murder could only have happened from behind. Dr. Torre testified that the attack could only have happened from the front.[10] Dr. Torre was questioned about the lack of defensive wounds and while he agreed that normally for an attack like this you'd expect considerably greater defensive wounds that the lack of defensive wounds was not something he felt needed addressing.[11]
Expert Testimony on Multiple Attackers
Dr Lalli and Dr Liviero testified that "the nature of the bruises and multiple wounds caused by several different methods -- suffocation, strangulation and stabbing -- led them to deduce Kercher was attacked by more than one person.[6] Dr Liviero stated "There were more hands involved"[7] which is basically what it comes down to. Rudy as a single attacker does not have sufficent hands to do all the required tasks. A single attacker needs one hand to wield the knife which just leaves a single hand to restrain Meredith and there is no way to restrain someone who is upright with just one hand. The cuts from both sides is also very difficult to explain with a single attacker.
Two defence experts testified that they saw no evidence that more than one attacker was involved although both these experts declined to examine the victim's body.[8] Declining to examine the body and instead working from pictures is a strategy that defence experts use to give them more room to interpret evidence in a favourable light to the defence without actually lying.[9] There is no other reason to work from pictures rather than from examining the body. The defence experts also disagreed on how the murder happened. Dr. Introna testified that the murder could only have happened from behind. Dr. Torre testified that the attack could only have happened from the front.[10] Dr. Torre was questioned about the lack of defensive wounds and while he agreed that normally for an attack like this you'd expect considerably greater defensive wounds that the lack of defensive wounds was not something he felt needed addressing.[11]