It’s not a stunt. Carson was going home and leaving the campaign trail during a critical 0eriod in the race. That is almost always a sign of a candidate about to suspend their campaign. CNN reported it and Cruz’supporters supporters made sure that Caucus goers knew about the CNN report. It would have been malpractice if the Cruz supporters didn’t make sure that everyone knew about the breaking news story.
You're wearing blinkers and excusing/absolving Cruz and his team for UNETHICAL behavior!
Not just Cruz supporters, I saw followers of other candidates tweet that this is a sign that Carson will drop out.