Davin knew how to do this, once upon a time. Once he discovered that it was a thing, he perfected it. And then he went on to perfect other things with his tongue.

He goes a bit cross-eyed and probably looks ridiculous, but he manages it. He can't pull the knot tight, so the stem looks more like a tiny pretzel from he pulls it from his mouth and holds it out, drunk and proud. "Ta da, an attempt was made!"