That is never a fun situation to be in, nothing is a more dangerous than a bull going after a heifer when you don't want them together. :D
It was smart of you to use the tractor instead of trying to get between them on your own, doing it without the tractor could have been dangerous. :D I'm glad it worked out in the end and you guys are safe. :D
God bless you and your wonderful family. :D Have an awesome day my fabulous friend! :D