Mark, Sammo...thats the best reason in the world to spot the bear before you call....IME sows DO put their cubs up a tree ASAP...then they come..
If you see them do that, you can get off the call..which usually stops them...and back out of the AO...

BTDT

If you don't see them do that, then Dober is right...problem on your hands...

Ingwe

"...the left considers you vermin, and they'll kill you given the chance..." Bristoe