If the animal flees
If you spook the animal of your desire, follow the tracks crouching. Use your optics and try to spot it, and also look for tracks or vocal signs. Do not go too fast. The animal can stop fleeing abruptly and return to roaming, and the roaming can be in any direction including coming right back at you. If you end up bumping into the animal it will flee again. Take your time. If the animal is worth it, a few more minutes will pay off.