[Avodah] R' Nissim Karelitz's Beis Din: Kohanim cannot fly from Ben Gurion

[Micha Berger via Avodah]

On Tue, Nov 01, 2016 at 12:03:09AM -0400, Akiva Miller via Avodah wrote:
: This is the part I don't get. What good does the fence do if he is carrying
: it? How does a portable fence insure that he won't step over a grave?
: 
: A portable fence might be effective in establishing distinct reshuyos, but
: it's not much good as a ma'akeh.

This was a recent AhS Yomi for me, see AhS YD 371:27 <http://j.mp/2euVLbL>
(wikisource.org).

I would think ma'akeh is an overstatement; we are relying on the kohein's
awareness, the marker need not make his approach harder. I say that
because either a fence or a trench -- of any width -- would allow a
kohein to come within 4 tefachim of the qever instead of 4 amos.

I wouldn't call a 1 etzba (or less) wide trench a "ma'akeh", it created
the wrong implications (we need something that stops him) in my head.

In either case, I share your confusion about how a mobile wall would help.
You get the 2 reshuyos to allow it deOraisa, but you don't cover the
gezeira to avoid accidental negi'ah or ohel.

Tir'u baTov!
-Micha

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