Due to my surprise, I suppose my brain did not function with its normal quickness, for I gazed at the prone figure for several seconds before I saw the blood that oozed out from under the tight green cap. Regaining my power of action, I dragged him out of sight back of the big tree. For a few moments I busied myself in an attempt to staunch the flow of blood. The wound was not a deep one. My companion was more dazed than hurt. But what of the pursuers? I took the weapon from his grasp and examined it hurriedly. It was not unlike the automatic pistol to which I was accustomed, except that it apparently fired with a button instead of a trigger. I inserted several fresh rounds of ammunition into its magazine from my companion's belt, as rapidly as I could, for I soon heard, near us, the suppressed conversation of his pursuers. There followed a series of explosions round about us, but none very close. They evidently had not spotted our hiding place, and were firing at random. I waited tensely, balancing the gun in my hand, to accustom myself to its weight and probable throw. Then I saw a movement in the green foliage of a tree not far away, and the head and face of a man appeared. Like my companion, he was clad entirely in green, which made his figure difficult to distinguish. But his face could be seen clearly. It was an evil face, and had murder in it. That decided me. I raised the gun and fired. My aim was bad, for there was no kick in the gun, as I had expected, and I hit the trunk of the tree several feet below him. It blew him from his perch like a crumpled bit of paper, and he _floated_ down to the ground, like some limp, dead thing, gently lowered by an invisible hand. The tree, its trunk blown apart by the explosion, crashed down. There followed another series of explosions around us. These guns we were using made no sound in the firing, and my opponents were evidently as much at sea as to my position as I was to theirs. So I made no attempt to reply to their fire, contenting myself with keeping a sharp lookout in their general direction. And patience had its reward. Very soon I saw a cautious movement in the top of another tree. Exposing myself as little as possible, I aimed carefully at the tree trunk and fired again. A shriek followed the explosion. I heard the tree crash down; then a groan. There was silence for a while. Then I heard a faint sound of boughs swishing. I shot three times in its direction, pressing the button as rapidly as I could. Branches crashed down where my shells had exploded, but there was no body. Then I saw one of them. He was starting one of those amazing leaps from the bough of one tree to another, about forty feet away.