Brett,
Hope your mate is soon on the mend and that he can get by with finger not working how it should.
Just a fact of life , that you have to get used to.
If you work in this industry for all your working life , somewhere along the line you will get hurt, the only factor that you need to worry about is the existent of the injury. You try to look out for your own safety but long hours, tiredness, site work, and familiarity will eventually get you. It only take a split second and its A&E.
I think i have done ok after 30+ years 3 pads of my finger with little or no feeling and 1 fingernail that look like abstract art [embarassed]
Be as safe as you can
John