As the Wheelies see you draw your sword,
they stop and chatter excitedly.
One of them — evidently the leader —
sends the smallest one back up the passage (presumably to fetch help).
The other two draw knives and roll slowly towards you.
You must resolve this battle by fighting them each in turn.
Eventually after a long and exhausting fight, you win.
Now you may take either the left-hand passage,
or the right-hand passage.