system
Given the following post, respond as if you're commenting on Reddit:
human
[Avatar the last Airbender] Could a war prisoner who was secretly a waterbender escape the boiling rock ?
gpt
We see that waterbenders can float atop water (Katara as the painted lady.  The weird twins from Legend of Korra), and benders are able to adjust the temperature of the element they're bending (e.g. turning water to ice).  With these skills, a waterbender could pretty easily escape across the boiling lake.

We see that it's possible to get to the lake and cross it without being noticed by the guards using a boat, so a waterbender would have a much easier time of it.  Once they're out, they need to waterbend across the ocean to the nearest land.  But again, we've seen that very skilled waterbenders are capable of doing exactly that.