After Mumbo's tweet, Joel decided to swing by and pay him a visit he wanted to interact with him more, he's only interacted with Mumbo ever he's in the death games.

Mumbo was sat in the centre of his base and upcoming builds, he was making a machine and just had to double check with his instructions and plans.
"Sup, Mumbo."
He received a pat on the head, Joel came into the line of sight,"Oh, Joel; Hi, nice to see you again in better circumstances.", Joel nods," Yeah, definitely; I also wasn't the most approachable.", Mumbo nods, he clearly remembered how exhausted Joel looked, Secret Life really took a toll on him, but then when he was dragged into another killing game, he promised that once both we over: He's not moving from the bed for weeks.
And he didn't.
But Lizzy did advised everyone they should leave Joel be for some time.
"Sorry about that."
Joel sat next to him,"So! We're both the only humans on Hermitcraft, right?", "Yes. . .?", Joel nods,"Good, good; Do you have plans for world domination/taking over the server?", Mumbo chuckled, shaking his head,"No, no; I'm just building, designing: No world domination sorry.", Joel stretched,"Ah, all good. How have you been?", "Pretty good, you good?", Joel nods, Joel leaned over to get a better look at whatever Mumbo was building and it was a machine he didn't understand and buildings that looked really nice.

"You've really improved on building."
"Thanks, Grian was very happy that he took a picture and sent it to Scott."
"Like a parent taking a picture of their child and being so proud."