suddenly this guy just drifts in, boink! making contact.ou want him to go spinning off towards the bottom, backing up to that point, remember i said there was a guy in the bottom corner, that's the same guy. >> what was he doing? >> he's on his back, too, it looked like. >> that's the thing, they're saying with this video don't try pulling off moves or moves you're not certain of when you're above other people, because once he was on his back, he kind of drifted accidentally and came straight through the middle. >> oh, no, you can imagine how scary it must have been for all the other buddies to see their guy get hit and go down, because you can see his body just fell. >> seems to be happening so slowly but we know how fast these guys are traveling. they're like 120 miles an hour, zipping across the sky, even a small impact is the kind of thing that could kill you. fortunately in this case, this is just one of those videos people get to learn from. >>> i'm about to show you two things that could have been avoided. this woman had to call emer

bink, boink, woop, woop, woop, woop, woop. [ laughter and applause ] commentators on the right have spentsince the parkland shooting insisting that teenagers are somehow too immature to comment on an issue like gun reform. when in reality, the only people who sound like children are the ones using phrases like "good guys" and "bad guys" and pretending that all you need to do to stop a school shooting is have someone there to run in and go -- >> bink. [ laughter and applause ] >> seth: this has been "a closer look." ♪ [ cheers and applause ] we'll be right back with uma thurman, everyone. [ cheers and applause ] ♪ >> announcer: for more of seth's "closer looks" be sure to subscribe to "late night" on youtube. ♪ ♪ introducing the npower jean aka the perfect straight. and introducing the new relaxed slim for men. power up with up to 50% off all jeans. adults from fifteen dollars, kids from ten dollars. at old navy. dial your binge-watching up to eleven. for a limited time, get four unlimited lines for thirty-five bucks each. woah. and with netflix included, you can watch on any screen. prrrr