brainfuck, 1799 1584 bytes

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Try it online! !enilno ti yrT Explanation: The characters dW ,orleH or Helro, Wd respectively are loaded into consecutive cells by the code at the start/reversed code at the end and then the code in the middle outputs the desired cells, repeating the l and o as they're the same distance away in either direction. Edit: Saved 213 bytes thanks to @JonathanAllan.

brainfuck, 1998 bytes

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Try it online!

!enilno ti yrT

Maybe more golfable but for code to reverse, no loop is allowed