JMNT(i)
15 And they are progressively (or: one after another) coming toward Jesus, and continue intently looking at the "demoniac" (the one that [had been] constantly affected or tormented by an animistic influence, or "demons") – the one that had been having (holding; possessing) "the legion [a Roman regiment of 4,000 to 6,000 troops]" – now continuing sitting clothed and being continuously sensible, orderly and cooperative (sane and of sound mind). And they became afraid.
16 Then those having seen [it] thoroughly related to them how it happened to the "demoniac," and about the young swine (hogs).
17 So they at once began to be repeatedly entreating Him (calling Him alongside and begging Him) to go away from their district (bounded area or region).
18 And during His stepping into the boat, the "demoniac" kept on entreating Him (requesting Him to be a paraclete), at His side, to the end that he might continue being with Him.
19 But He did not let him (or: did not release him from [his area]; did not allow him; or: And He did not abandon him). Instead (or: Nevertheless) He is then saying to him, "Be going away (or: Progressively lead the way) into your home (your house, or, household), toward those of your area and association, and fully report back to them (or: thoroughly tell them the news and the story of) how much the Lord [= Christ, or, Yahweh; D reads: God] has done for (to; in) you, and that He mercied you (acted in merciful compassion to you)."
20 So he went away and started (or: goes off and begins) to repeatedly herald a public proclamation within the Decapolis [a league of ten cities] how much (or: as many things as) Jesus did for (to; in) him, and everyone continued being amazed (or: all began expressing wonder and astonishment).