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Why did Rabba have to get up to kill Rabi Zeira?

The gemara in Megila 7b says קם רבה שחטיה לרבי זירא Rabbah got up and killed Rabi Zeira. Why did he need to get up? Rabi Zeira was a short man, as we see in the bottom of Bava Metzia 85a קטין חריך שקי, and Rashi explains דאיניש גוצא הוה.