The Secret Service has come under fire this week after a rifle-wielding gunman was able to scale a building and shoot at former President Donald Trump, wounding his ear. And now, experts say it wasn’t just the response leading up to the shooting that raised questions — it was their puzzling actions in the immediate aftermath. Former Secret Service agents and field experts told NBC News they were stunned by the Secret Service’s response to what unfolded Saturday at the Butler, Pennslyvania, rally. Want more breaking political news? Click for the latest headlines at Raw Story. “They stayed on th…