The first of two bombs exploded outside Marathon Sports on April 15, 2013 and the store’s manager quickly took on a different role as a medical aid.

Wednesday, 44-year-old Shane O’Hara testified as the second witness in the trial of accused bomber Dzhokhar Tsarnaev.

O’Hara explained how he used clothing and goods in the store to tie tourniquets on people who were bleeding.

Choking up, O’Hara said the bomb sounded like fireworks or a cannon, and then the only thing you could here were cries, sirens, and people yelling “stay with me, stay with me.”

He told the jury he is haunted to this day about having to make decisions on who needed help first and who was most injured.

Video of him caring for the injured was played, but O’Hara said he did not remember every frame.

He was able to say that when it was all over, the store closed for 10 days because the windows were blown out and the rugs were ruined.

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