Double violation... but not on a free throw shot

[bradfordwilkins]

Had a fun one today -- Coming down the floor and A1 and B1 are josstling at each other a little and A1 is trying to get open and runs out of bounds (a good 3 feet outside the sideline) and is simultaneously followed by B1 who goes out a step behind him.

We're talking both of them running down outside the sideline by 3 feet. I whistle the violation and brain goes into overdrive and I decide the only other Double "violation" I know of is a free throw and in that case we have a jump ball...so I went to the arrow, no complaints around.

But was I correct? And are there any other "double violations" ?