At the same time, it was not to be forgotten that the most stealthy foe of all was prowling among the trees on the right.
The Professor's hope, as has been explained, was that his own retrogression had disconcerted the plans of this special miscreant for whom, however, he kept a keen watch.
The archer still held his bow, with the arrow in place grasped by his right hand, the long weapon resting against his hip.

Provided he was right-handed, the bow would have to be shifted to his left hand, the arrow drawn back with the right and the missile then launched at his foe.

This, it would seem, involved enough action to give both Grimcke and Long abundance of time in which to anticipate him.
But there remained the possibility that the savage was left-handed, in which event, the necessary action on his part would be much less, though sufficiently complicated to afford the white men abundance of time to anticipate him.
The native _was_ left-handed, with a quickness that surpassed all expectation, the bow was suddenly raised, the end of the arrow drawn back and the missile driven directly at the breast of Grimcke.
At precisely the same instant, the latter's strained ear caught the crackling of a twig, above the din of the rapids (which was much less there than below), and something was discerned moving among the trees on his right.

His frightened glance in that direction gave him a glimpse of a dusky figure in the act of hurling his javelin.
Thus it was that the spearman and archer let fly at precisely the same instant, and Jared Long, who was so anxious to help his friend, saw only the deft movements of the archer.

Grimcke could not fire at both in time to save himself, but he instinctively did the very best and indeed the only thing that could be done.