Elder guardian likes me? Minecraft 2018 xbox one?

I know this isn't the place to ask this at all.
But I'm playing minecraft on creative mode (easy) and I have come across an elder guardian.
I was curious because I've never seen one before so I grabbed a diamond sword to start killing it. But every time I hit it, it throw out little heart like being tamed.
I tried it with regular guardians and that did the same. It flew off hearts and then settled somewhere else to stare at me?
Are they just masochists? Or is it a glitch?