you can just leave that as it is
&NOAH walks to spot 1.019 63 180 in zone 2 in 8 AND NOAH does it while walk_talk_neutral_loop AND LAV walks to spot 0.964 68 158 in zone 2 in 8 AND LAV does it while walk_neutral_loop AND pan to zone 2 in 9
and the rest will go on as it is. but when LAV will be talking NOAH will still be doing the walk_talk animation and you do not want him to talk since LAV is talking
the & command helps you when you want an action to happen at the same time as something else in the next line. in this case the dialogue and the animation of the other character