What is in this image? Describe it as if you were explaining it to someone from the 15th century.

The image depicts a scene that could be likened to a humorous tapestry of mythical beasts. There is a fanciful creature, which appears as a blending of a dragon and a lizard, wearing armor like a valiant knight. This creature is partaking in an extraordinary activity sliding down into a small pond encircled by a ring of stone. Near the pond are tufts of grass and behind lies a wooden fence, marking the edge of this peculiar enclosure. On the ground, a small piece of fabric or cloth mat lies aside, possibly for sitting or resting upon after the playful water activity. The way the creature slides with a joyous demeanor suggests a scene of leisure and play, echoing the courtly pastimes one might imagine in a royal garden, although with a fantastical twist.