This can easily be done. But the thing is, you'll have to alter the on QUERY script that you already have. Reason being, mIRC will react to the first one it gets to, ignoring any others after it. The implementation is rather easy, so you should be able to do it youself. If not, paste the code (or if it's rather long, paste it to a pastebin, and paste the pastebin url here.)
Just try adding
Code:
if ($nick == NS2) {
 notice $me ( $+ $nick $+ ) $$1-
 haltdef
}