I've just watched the first video and this is a brief summary for those who are interested and haven't seen it. It's actually not as mind numbingly boring or complex as I'd feared and I have to say Murray is making a pretty good job of ripping Shafer's testimony to shreds.
He's basically saying all those graphs and charts that Shafer presented were just scenarios Shafer put together, to try and find one that would 'fit' with the drug concentrations that were in the coroner's report. But they "did not happen, do not make sense and do not fit". He convincingly debunks a number of 'conclusions' Shafer had drawn.
He calls Shafer out on destroying Murray in November 2011, by saying Propofol shouldn't be used in a home setting, then a month later supporting another doctor for doing the same in a far less 'ethical' situation.
His main argument is that MJ was not on a drip of propofol and if he had've been then Murray agrees he should've/would've been monitoring him closely. He states that MJ caused his own accidental death through a clandestine combination of self administered Propofol, oral Lorazipan, and sudden withdrawal from a concealed Demerol addiction (from Klein, which Murray had no knowledge of, and if he had he would've treated MJ differently).
I'm assuming Part 2 will attempt to explain how this clandestine activity took place. Unfortunately I probably won't get a chance to watch that till next week ...