Fog Update???

So uh, hi. I just needed to write on the forums. 
I discovered some weird stuff when playing Minecraft when I found fog. I'm not sure weather it was an update so I just need to know 
if anybody else experienced this as well. So yeah, this is what happened I guess
I dont want to come off as "OmG GuYs I FoUnd SoMeThIng AhhhHhHh" since I know that it is all over the forums anyway. I 
dont want to even look at it that way since it may of just been my game. Either way, it started when I joined my friends server. We where just bored and running around. Then my dog ran away as I went to go chase it. My friend following as well. I had my render distance all the way up as normal and the weather was clear the entire time, yet suddenly fog came all around me and my friend as my dog kept running. 
I kept lagging due to the fog getting more and more intense until my vision was full. I typed in chat for my friend, they kept trying to get back to me but kept swept back by mobs. The strange thing is that this was day time! So we where both confused. We kept fighting the many mobs until my friend disconnected, then me.
I don't know what was going on. It seemed like a wave mechanic. Whenever your in fog, you need to fight the many waves of mobs until you can leave? I'm not sure honestly. I just posted this to see if somebody else has seen this or can explain ? Also the disconnect thing, I'm assuming it was my lag from the fog. Atleast I think this? Yeah I don't know. Anyway bye.
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Category:Creepypasta
Category:Supernatural
Category:Short Pastas