Scary situation when only armed with a stick and a string.
A similar scenario happened to 2 longbow hunting friends of mine from here. They were hunting elk up in the Hudson Hope area, sitting on their tree stands attached at ground level, feet flat on the ground.
The one bugling, called in 5 grizzlies. They came from 4 different directions, so 2 were cub and sow. Once the bears smelled the hunters, they ran off. Lucky. They do not bow hunt that area or any other area any more.
Another bow hunter from here had a sow with a 2 year old cub dog every movement they made for 3 days, waiting, I assume for he and his son to shoot an elk. She and her cub stayed within 100yards of them at all times.
That happened the previous year and they no longer hunt that area with their bows.