"We step down beside the bed."

Translation: Lelépünk az ágy mellé.

[O_Matty]

Why is beside "mellé" here instead of "mellett"?

[RyagonIV]

Because you're moving to that spot next to the bed.

[cymbidy]

Ok, but that's not necessarily true from the English sentence -- there's no direction given.

[RyagonIV]

That is correct. It probably should be accepted either way.
But from a practical standpoint, mellé makes more sense since you're only ending up next to the bed, maybe by stepping down from a ladder or a short stair. If you say mellett, you'd have to spend your whole moving experience beside the bed, and I have a hard time coming up with any situation where that could happen.

[cymbidy]

Right, ok, that makes sense. Though sense doesn't always rule, at least within the context of these lessons (flying kindergarten teachers, anyone?). :)