You hold hand and wait for the dragon to strike.  It rears up its  ruby red scales glittering in the sun and gives off a roar that chill your bones.   Arcs of rainbow light lightning spray from its mouth in a grand display of electromagnetic might.   It lands its forelimbs back into the sand it hisses but does not attack.

The fool beast is afraid, strike now while you have the advantage!

It may be friendly, perhaps you have misjudged it.  Maybe you could offer it a lightstone as a snack.