Blimey, sounds like he's been quite lucky………Its usually the innocuous little jobs that get you.
My mates wife gets out of hospital today after having surgery to remove the end of her finger, infected bone from a spell she got in a month ago while sanding skirting board.
Last year my brother nearly lost an eye after getting a tiny piece of wood imbedded in it whilst using electric hedge trimmers in the garden…..he fells trees for a living with a blooming great chain saw !
At tech college in Leeds as an apprentice, one of the lecturers wore an eye patch, lost his eye at 18 using a cold chisel, so we had it ingrained into us that mushroom heads were a big no no.
Hope your pal makes a full recovery 
Edited By Alan Waddington 2 on 08/07/2016 18:44:45
Edited By Alan Waddington 2 on 08/07/2016 18:45:04