Eight people were killed in a deadly crowd surge during a Travis Scott performance in Houston on Friday. As footage appeared showing slapdash security (and the man himself continuing to sing while a body was being carried off) anger flowed toward Scott and the show's organizers. Crowd surges, though, have the mindless power of natural phenomena, turning people into a fluid mass that can bend steel and topple walls.
Here's security footage of a packed Oasis concert in 2005 that shows how powerful and dangerous crowd surges are, lifting concert attendees off their feet and pushing them forward for yards, crashing like a wave against security barriers, then radiating back outward from them.
The band briefly halted the show while the barriers were righted, and told the crowd to step back. Jump 2:15 in to the video below: