If a cow from Reuven goes to the field from Shimon takes food there and goes to the field to Levi what's the Din?
Eliyahu Weill, Antwerp, Belgium
Dear Eliyahu,
In your specific case the Shulchan Aruch 391:7 says openly that the owner is free from paying damage since it's not in the Nizek's field (only he pays what he profits from the "free meal")
However in 391:12 the Din of Amir HaMisgalgel of Bavakama 20a is brought down. There are various waysto explain how this co-exists with 391:7 (such as explaining that an animal half -in and half-out is not the same as when the animal moves and takes the food with it) ( More is discussed at length in the S'ma and in the Biur HaGra on the Shulchan Aruch there.)
All the best, Reuven Weiner
why rashi doesn't say that?
Tosfos says that there is a problem between the Gemara on 20a the way Rashi explains it and the Gemara on 23a. The Bi'ur Ha'Gra (391:24) resolves that question by saying that Rashi learns the Gemara on 23a like the Ramah (Rabeinu Meir Ha'Levi). See there at length.
Reuven Weiner