about 3 weeks ago customer brings in a sick 6.0 with bad injectors ( failed buzz test, swapped known good ficm still failed). so took it apart, swapped injectors, get it running again and send it on its way. then 2 days ago, get a call trucks skipping again, no power, says he'll bring in next morning and drop off so i can look it over, then first thing yesterday morning get a frantic call at the shop, truck made a LOUD rattling noise, ran about a half a block and then crapped out in the middle of a busy intersection. so i lock the shop down and run into town with my solus to see if i can help him. get there push truck into parkin lot, hook up scan tool, see injector contribution failure code for #8, (replaced 3 weeks ago) try cranking while looking at data stream, see no high pressure oil i.e. 0 psi. even after extended cranking. so get it towed back to shop, put shop air on high pressure oil system, distinct leak at rear of driverside head, figure i crapped an o-ring on injector install, told customer i'd make it right and start tearin back into it, get it opened up, pulled oil rail off and half the #8 injector came up with the oil rail, holy christ thats not right!!!!!!. fished all the pieces outta the head, and put a new injector in and all seems fine now, but how does this type of failure happen, never seen one do this before. pics below. thoughts please.