Thank you all for your thoughts!
I know it was really important to my friend to find the remains, so I'm glad that was able to happen, even though it must have been really traumatic.
And as for the cat, super sad for sure but it was not behaving normally at all, way too aggressive and close to home. There's a family with a little girl who lives on the same property, the cat took Dingo like 20 feet from their home...and the little girl would sometimes run around outside at night when she didn't want to go to bed, through those woods! Could have been so bad...