And usually they stand with their fat belly touching the shelf so the end of their muzzle is far into the lane and the only way for you to escape the blast is to take a step or two back. Rifle shooters with decent etiquette stand back a step from the bench so their muzzle isn't nuking those on either side. One of the many reasons I try to avoid public ranges unless absolutely necessary.
Story time...
Several years ago I was teaching a neighbors daughter to shoot before she headed off to college. Her time was limited so I was stuck using an indoor range and it was packed with every lane full. Well we had some doofus next to us with his AR and one of those "echo" type triggers trying to get it to run. After the third magazine I asked if he would please take a step back into his lane so he didn't keep nuking us.
He and his buddies just kind of blew us off and kept at it.
I told the young lady I was with to step back to the tables and just keep an eye on our stuff. I went out to my truck and pulled my AMD-65 out of the locker and a few magazines. I walk back in and set the case on the floor as these guys kept blasting away whooping it up. I again asked nicely if they would just take one step back while shooting... and got the same response.
If you are not familiar with the AMD-65 it has 12" barrel and a brake that many refer to as...
"The loudener"
I pulled the ole gal out of the case and set it on the shelf along with several magazines, rocked one in, charged it and waited. As soon as they started on their next magazine I leaned as far forward as I could and let loose with a full 30 round burst (its select fire), dumped the magazine, rocked in another and let another 30 go. I set it down on the shelf and stepped back to the tables and enjoyed the looks on their faces.
Needless to say they packed up and left with their ears ringing and faces peppered

Of course soon half the shooters in that bay came over asking
"WTF were you shooting?"
AMD-65... for when you absolutely just have to piss off everyone at the indoor range