The reporter in the clip above mentioned that the sparks resulted from one of the engines that was scraping "on the pavement". Weird runway at LAX if it has a pavement. Who is it there for? Has it a zebra crossing as well?
For a change, here's a reporter using correct terminology. In the United Kingdom, we refer to the hard surfaces used by aircraft at aerodromes as 'pavement', certainly in my 31 years in Ops at major UK airports. It's ICAO-speak, too.
It's also insightful that the reporter considered the potential damage to the pavement and the consequent debris that might ensue. Perhaps he's an old Airfield Ops hand.
Every pod scrape and wheel rim gouging not only creates damage and FOD at the time but breaks the sealed surface allowing erosion and stone hazard until the runway is resurfaced. Routine runway inspections really have to concentrate on these areas. The most useful bit of kit in an Operations vehicle is a dust pan and brush...