* Woods made string of birdies to grab brief share of lead * Backtracked late in round with pair of double-bogeys (Recasts at end of round, adds quotes) Dec 1 (Reuters) - Tiger Woods's first competitive round in nearly 16 months provided more questions than answers as he teased golf fans with a performance that fluctuated between brilliant and dreadful at the Hero World Challenge in the Bahamas on Thursday. Woods, who had been sidelined due to a chronic back injury, shot a one-over 73 to sit in second-to-last place of the elite 18-player field, nine shots back of leader J.B. Holmes. "If you think about it I hit the ball into three bushes and a water ball today, it could have been something really good," Woods told the Golf Channel. More...