infanticide is very common in bears. A mature male will kill the cubs of a sow to bring her back into estrous so he can potentially breed her again. Happens a lot with Griz and Brownies, lesser in Black bears, but does still happen.
I was shocked watching the documentary on DC on bears in Alaska. A big griz killed a cup and not much later the defeated sow was madding with that bruin.
I mean maybe day or even hours later.
