That would be looking at the Me-163 and not thinking (or I typo'd).
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There were so many experimental variants of the -262 around that it is well within possibilities. Add f.e. the drop snoot variant and it matches the above report quite nicely...
Not saying it was a Me-163 but I can't think of any other tail-less LW fighter.
Here's a cool print I came across:
But I don't think the Ho-229 could have pulled off the kind of maneuvers that were said to have been performed. It also didn't have te specific thrust to dive and climb like that.
The 229 was rather large, as it was originally conceived as a fast bomber/fighter-bomber, so I cant see it outmaneuvering, or outfighting a fighter, even one as heavy as the P-47.