Curator Sharon Herrell stated the problem well.
"After a day of allowing Tasha to be out, she came back to her pen at 4:30 but wouldn't go in. She turned around and walked back into the woods. She is no longer afraid of Holly. 
After a long day exploring, Tasha refreshes herself in her pool.She wants to be free to roam the big enclosure. That means she will soon have to deal with Lucky. Lucky’s displays toward Tasha have been displays of uncertainty—pounces, blowing, slapping the ground—not displays of outright ferocity. Holly was also giving displays of uncertainty, just as Tasha was doing toward her once Tasha got past her period of abject terror. They became friends. I believe that Tasha and Lucky can progress in the same way."
Displays of uncertainty look ferocious but are performed by six-pound cubs. I’ve seen a bear pounce toward a person and slap the ground, only to calm down and eat out of the person’s hand. I saw a mother bear do that toward a person who was in her den with her cubs when she unexpectedly returned. There is no absolute certainty. If Tasha remains out, we can’t keep Lucky in indefinitely. Lucky’s displays are waning. We wanted to wait longer before allowing access between them. We may have to shorten the timetable and be on guard for actions that might need intervention. The staff will remain watchful. Curator Sharon is off tomorrow, though. The bears will dictate what happens over the next few days. Some things are a balance between tight control and giving the bears the freedom to live a stimulating life. The staff will be watchful, ready, and flexible in trying to do what is best for the bears in this time of uncertainty.
Out the window at the WRI, Samantha’s four cubs are all together in the darkness.
Thank you for all you do.
Lynn Rogers, Biologist, Wildlife Research Institute and North American Bear Center
Editor's Note: We learned that Tasha did return to her enclosure this evening after Curator Sharon Herrell wrote the above.