But suddenly a wonderful change came over him. A laugh was heard out in the passage, in which stood Haxo the Bull and his satellites--a laugh thin, acrid, unmistakable. It stung Wat to the roots of his heart. For a moment he was in difficulty. The problem divided his mind even between thrust and parry. There was no man whom he knew well whose laugh rang like that. But even as he fought he remembered how once, in the palace of the stadtholder, he had seen the prince come in leaning upon the arm of a young, dark-haired man, whose meagre, hatchet face was decorated, for all ornament, with a black mustache so scanty that it seemed twisted of twenty hairs, and whose ends hung down, one on either side of his lips, like a couple of rats' tails. This, and a certain bitter, rasping laugh to which he had at once taken a dislike, were all Wat remembered of that young man. But after the distinguished party had passed in to supper he learned that the prince's companion and confidant was one of his own nation, Murdo McAlister, Lord of Barra and the Small Isles, and that he was one to whom the Prince of Orange looked for counsel in all that did not touch the ecclesiastical position of affairs of Scotland. The laugh which rang out from the dark passage behind the Bull, the Calf, and the Killer was the same which he had heard at the supper-party of the stadtholder. From that moment Wat knew that in no event had he now any chance for his life. It mattered little whether or not he killed John Scarlett. Barra would certainly have the papers. For he knew the man well enough to know that, having taken such trouble to obtain the return of the numbers and positions for his own traitorous purposes, he would never let the bearer of them slip through his fingers. No oaths of his own or another would serve to bind Murdo of the Isles in that which concerned his schemes. Yet even in that moment of agony Wat could not help wondering why Barra had taken so difficult and roundabout a way of obtaining and transmitting a paper which it would have been perfectly easy for him to have gained by means of his official position, and to have forwarded to the King of France by more ordinary channels. But, however this may be, certain it is that the laugh irritated Wat Gordon strangely, and at the first sound of it he sprang towards Scarlett with an energy and fierceness entirely unlike the lassitude with which he had previously fought. From that moment he forced the fighting, attacking with furious vigor and astonishing rapidity, so that the great master-at-arms soon found that even he had enough to do simply to stand it out on the defensive. Yet Scarlett smiled, too, for he thought that this bout of youthful fury would soon wear itself down, and that then he would easily enough get in his favorite deadly thrust in quart, to which no answer had ever yet been discovered.