Blew power steering return hose

Trans hose should handle that there should be almost no pressure there. "I suppose" there could have a bunch of air that got hot and expanded if you didn't get it out of there. Foaming when partly empty or refilling is common, they can make a mess. I've done stuff like fill it, start for a few seconds, let it sit. It will burp. Try again. After a few tries it usually stabilizes some, work the wheel back and forth slow to bleed