In reply to Rocknast:
> It is good to stand closer 9 times out of 10. But it's not usually a big problem if u don't.
It actually adds considerable risk in several ways, even more so on trad routes.
First it alters the direction of pull on the first runner. If the leader falls the changed direction could easily pull the nut up and out, causing at a longer fall than necessary.
Second is the altered direction of pull on the belayer. If the belayer is much heavier than the leader it might be OK but if they're the same or the leader is heavier the belayer can be pulled off balance, dragged sideways and thus may trip or stumble. They may even end up letting go of the belay device and if it's not autolocking the leader could deck it.
Of course if the leader doesn't fall it won't make any difference where you stand but if that's what you're relying on for safety then they may as well solo the route.