Al Horford missed Tuesday’s regular-season home finale against the Raptors with a sore left shoulder. The center was scheduled to travel with the Hawks to New York for Wednesday’s game against the Knicks. “A little soreness,” coach Larry Drew said calling the move precautionary. It was the seventh game Horford has missed this season. Johan Petro started in his place. The Hawks also played without DeShawn Stevenson, who is suffering from a cold. Sympathy for Boston: Drew took a moment before his media session following Tuesday’s morning shootaround to express his sympathy for those involved in the Boston Marathon bombings. “Our prayers go out to all the victims and the people who were affected in the tragedy in Boston,” Drew said before taking questions. “Our thoughts and our prayers are with every one of them. It doesn’t take knowing someone who was there. When those things happen it really hits home because first of all you don’t imagine something like that happening to a group of innocent people enjoying a celebration. All of a sudden lives are changed. It’s just horrific.”