Heads Up - Part 1: "Headsplitter"

Hello, I'm here to discuss something abnormal that happened in my world. Now, I'm not very good at minecraft, I've only played for a week or so. Because I'm new to this, I don't know many crafting recipes, or how to make a decent house to keep me safe. But other than that, I've been surviving for a while now.

Now, this is what happened. I was walking around, exploring and getting food, you know, the usual, but then suddenly I was shot by a skeleton (with very low health after falling) and died. I respawned and tried to find my house, because I didn't have a bed to save at. I was defenceless, so I had to avoid as many mobs as I could. Out of nowhere, I was shot by an arrow. I turned around, and it was another skeleton. Aside it was two zombies that headed after me.

The weird thing was, every now and then, some mobs would grip their head as if they were having a massive headache. I didn't think much of it, since I thought it was just their animation or something, but what happened next proved that was not the case at all.

I reached a dead end. I turned around, arrows whizzing past me. The zombies closed in, I thought I would die, when suddenly they stopped and gripped their heads. Their heads were moving around, when finally they completely '''exploded! '''A green ooze splattered out of their heads as it happened. It caught me very off guard. But there was another problem. The skeleton was completely fine, and kept shooting arrows.

I darted past it, as I passed by another zombie with their head exploding as well. I saw a house in the distance, not my house though, instead it was actually a village. I ran inside one of their houses to escape the skeleton. But what I found in the house terrified me. Villagers were on the floor, with the same green ooze spewing out of their heads. I left the house and kept running until I found my house. I eventually found it and hid inside it and disconnected.

I don't have a clue on what is happening, but I hope it doesn't happen to me.

Part 2 coming soon.