welcome back. that's because we're under cross-examination right now. there is this masterful cross-examiner. the prosecutor going after the defenses expert witness. a use of force expert. he's had a lot to say about the discharge of weapon, about the physicality of the two people involved in that fight that night trayvon died. and now he's been taken to task. have a listen. >> the evaluation of the case, just like the gentlemen said, i can't base it off somebody that may make self-serving statements. the concept of time that everybody constantly gets hung up on is the fact whether it's 15 seconds, 30 sections, a minute, whatever the case might be, everybody's concept of time is different. i don't make a huge deal out of what his perception of time would be for this given period.