brain damage and caused the heart to stop. reporter: dr. martin tobin, an expert on breathing and lung function, testifying he watched videos of floyd s final moments hundreds of times, explaining what he saw when the officers pinned floyd down on the asphalt, handcuffed. it s like the left side is in a vice. it was almost to the effect as if a surgeon had gone in and removed the lung. reporter: dr. tobin testifying the officer s actions interfered with central features of how we breathe. to understand the knee on the neck, you need to examine your own necks, all of you here in the jury, like i am doing now. reporter: the jury captivated and most did touch their necks as the doctor spoke. he walked them through the video, frame by frame. pointing to chauvin s body position in this image. what you re seeing is that the toe of his boot is no longer touching the ground. this means that all of his body weight is being directed down at
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someone who had several torches. reporter: in she s the deb e debates presence or everything can be them. it s the can do or an audience. they re going to sink or swim. after all of the study and e rehall rehallals. you re watching on television, and they re doing everything. but then, there s no way for you to know what it is like. call i can tell them is to watch for body position and then, for all lane to get a top. it will come back to bite you.
know you may not want to go in. there s so much blood. this is really awesomely scary. reporter: the police were not exaggerating. when candace finally got inside, she says, michael brought her to the back staircase where it happened. my sister s blood is washed in pools up against the wall. i mean, her blood was everywhere. reporter: the image would be seared in her mind. it didn t look right. she couldn t go there. i still wanted to believe it was an accident. i didn t want to think something horrible happened. reporter: but all that blood, up the walls, could it all be from a fall down the stairs? and that s precisely what was gnawing at detective holland. i ve seen falls. um i ve had family members fall and to me it did not look anywhere like like a fall. reporter: something to him seemed off about kathleen s body position, too. her body was definitely not in the position that it would be in if she came to a final resting position after the fall.