There are areas of West Texas where we have some H2S, but it's not as prevalent as in some areas in Mississippi.
My granddad was a Wildcatter back in the day. Many were the horror stories he told us.
There's a bunch of hydrogen sulfide up in the overthrust belt too.
If you do get more info, maybe they hit a gas pocket, if you don't, it could be the lawyers are involved... mud pressures, hardware failure, whatever.
Would you be kind enough to ping me when you find more on it?