Tezcatlipoca actually hissed, sounding for a moment like an angry jaguar. He didn't take surprise well, and he really didn't take being interrupted well.
"Get out of my face," he snarled. He could see how unwell Xolotl looked, and under other circumstances, he might have offered to heal him the same way he'd healed Quetzalcoatl, but Xolotl had interrupted them while Tezcatlipoca's rage was still barely beneath the surface, and it was all too easy for that rage to come back.