Can christians here explain Mark 5:2-13?

[Ksa]

That sermon is such a poor read. It is so tangled and frothy. The goal of communication is clarity of idea transmission. That word salad is pathetic.

It's just a heavier religious text...for example, this answers your question pretty accurately:

When we look at the conversation between the demoniac and Jesus, we see that in the case of the demoniac it is very difficult to get a sense of where the man ends and the demons begin. The text interweaves the responses so that they are hardly distinguishable. So we may wonder what or who it is that is responding to the Lord's presence in the Gaderene region.

We can gain an appreciation of the tension that the person in this state of mind must endure; for despite the opposition of the hells within the man to the Lord, he runs to the Lord and worships him. What a remarkable response, given this man's condition! What causes him to run to Jesus to worship him? Is it his perceived need for deliverance, or is it the demons within him, hoping for a reprieve? We are not told. But given the situation, it is probably a mixture of both.

Goes along the lines of what I said.