I would say that this may be "an accident"...where someone has made a "mistake".
So true. Ever had someone unexpectedly pull up in front of you on short finals? Happens quite a lot, I had the fuel truck do that to me once
. Crossed every finger and every toe, even recited a prayer in every religion I knew for the donk not to quit on me as I sailed over it by just a few feet.
Glad there were no fatalities and hope they recover soon enough to get back in the saddle.