You and your coworker are loading boxes into a truck on a busy street when a bicyclist, riding on the sidewalk, suddenly collides with your coworker. the bicyclist rides away, apparently uninjured, but the man who was struck is still holding his abdomen and groaning. you have been trained as a first aid provider and think you can help, but you hesitate because you are unsure about your ability to help. what should you do?