OS: Mac OS X (ver 10.10.4, arch x86_64)
Java: 1.6.0_65 (by Apple Inc.)
Launcher: Minecraft Launcher 1.6.13 (bootstrap 5)
Minecraft: 15w32a (updated Wed Aug 05 14:22:42 CEST 2015)
While shooting one of the two dragons with bow and arrow, the game crashed. Report from console attached as text document.
(And yes, there were two dragons. Maybe that's not intentional from your side?)