The rules don't cover it (at the time the rulebook was written, there was no way to get a squadron of Tanks in regular
40K games, so it wasn't an issue).
I think resolving them sequentially would be the easiest way to do it, although it would probably be more in keeping with the rules to move the entire squadron and resolve them all simultaneously.
JSK-Fox wrote:What if you did it so that the enemies couldn't get out of the way...
THEY DIE!
This is not actually how it works. You can not kill enemy units with a Tank Shock, unless they perform a DoG attack. The unit is always just moved out of the way. If there is physically nowhere to move them to, you'll need a house rule to cover the situation... but it very, very rarely happens.