Keep One's Head Meaning

Example : 1895, Rudyard Kipling, “If—”:  If you can keep your head when all about you  Are losing theirs and blaming it on you . . .1910, John Buchan, Prester John, ch. 16:  The ruffian kept his head, and though the dog's teeth were in his shoulder, he managed to get his right hand free.2008, "Mother Throws 7 Kids Out Window To Save Them From Fire," CityNews (Canada), 7 March (retrieved 12 Dec. 2009):  Officials are calling the woman a hero for keeping her head and finding the only way out amid the panic of the smoke and flames.