Round 256: Bullet #10 misses completely. Glassy breathes for 2, but no sticking. Santa has 14 HP.
Round 257: #11 misses. Glassy breathes for 4. Santa has glass stuck to him, and has 10 HP remaining.
Round 258: Santa scrapes off the stuff. Glassy breathes for 2, and Santa has glass stuck to him. Santa has 8 HP remaining.
Round 259: Santa scrapes off the stuff.
Round 260: #12 misses.
Round 261: #13 hits (natural 20, rolled 42% miss chance) for 8. Glassy has 8 HP remaining. Glassy breathes for 1. Santa has 7 HP remaining.
Round 262: #14 hits (rolled 24-2=22 for long range) for 4. Glassy is at 4 HP.
Round 263: #15 misses.
Round 264: #16 hits for 8, and Glassy takes 10 damage from the ensuing fall. Santa is at 40N10E and has 7 HP remaining.
Enough of these mephits.
Next in round 265 for Neutral is a water mephit (Monster Manual). Come one, come all!