OUCH!!!! Sorry about your DH.

It is these kind of stories which is exactly why I stayed away any kind of saws, even though I need certain "simple" repairs around the house.
It's a little late for your DH, but, if he does plan to continue to make & cut stuff, tell him to get this tool, the
Fein MultiMaster (or cheaper clone out now, which I got.) Also, while I was at some House & Decorating trade show years ago, I saw a demo of a Occilating table saw that would not cut through the hot dogs, (used in place of fingers) on this saw, but were cut in half on regular saws at the demo. The guy said he sold many of that type of saw to high schools who have shop classes and it has saved many kids fingers. That's what convinced me to get this little handheld saw.
Regular saws like jigsaws or saber saws just vibrate too much for me. Not only was it scary to use, they vibrated too much while cutting wood, for me to cut a clean, straight line. also, the vibrating made me feel I wouldn't be able to control the saw well enough and it would jump off the board, and I may accidentally cut off a finger. Table saws completely scare me.
Several days ago, I bought the generic version of the
Fein MultiMaster tool.

I've been watching the infomercial over & over. It uses the same kind of saw that cuts off plaster casts after one has broken an arm or leg. So it's
designed not to cut through skin & bones. It's also not supposed to vibrate like crazy while cutting.
Well, if it really does what it says it claims, and I can save so much money over hiring a carpenter to just cut 6" off some shelves and other projects, it's worth the price. But, doing a Google search a few weeks ago, I found the cheaper versions came out, as Fein's patent for their $400 original version ran out.
Dremel now makes a $100
Multi-Max version and I bought the $35 version from
Harbor Freight just called the
"Multifunction Tool."
I did some test cuts on a scrap piece of wood and couldn't believe how straight & easy a cut I was able to do, with no vibrations. And I'm a female. I am seriously loving this tool.

I cut most of the shelves I wanted down and drilled & assembling them and putting the shortened bookcase
finally where I have been dreaming of putting the unit. It needed to be an exact size to fit a small cubby area.
Now, I've been seriously rethinking some renovations I have wanted to do. Originally, I had to come up with workarounds that wouldn't quite do, because they would involve too much sawing to get custom pieces to fit. Now I can do them!
Youtube: Multimaster demo
Here's a pic of the board I cut. The middle board shows the clean straight line I cut at the top. The pencil line on the back board was my
only guide used for cutting.

The little board at the bottom is the cut off excess.