Based on the angles of the first responders at the intersection of Guidestone Rd. and Hwy/Rt 77 and the layout of the structure, it looks like it was the Hindi/Swahili pillar(South East). Also the top stone corner between Egyptian and Babylonian is damaged affecting mostly the Babylonian part.

Edit: After looking at the recent drone footage from the property, it looks like there is additional damage to the capstone that coulden't be seen from the intersection affecting almost all of the Sanskrit side and half of the Classical Greek side.

Based on the angles of the first responders at the intersection of Guidestone Rd. and Hwy/Rt 77 and the layout of the structure, it looks like it was the Hindi/Swahili pillar(South East). Also the top stone corner between Egyptian and Babylonian is damaged affecting mostly the Babylonian part.