I think Heath is having some jealously issues. Normally he completely ignores Leo. Sometimes he will sniff at him and then walk away. But lately he has been running away from Leo. If I am headed towards the couch for a feeding and Heath is on the couch, he immediately gets up and runs away. I don't think he likes that this little monster has been screaming so much lately.
I also think Heath has issues with Leo not petting him. Or when I am paying too much attention to Leo, so he proceeds to do this: