Amud 22b

תוס' ד"ה אלא

Rather, said Rovoh; this is what he said; he whose wall was, etc. - אלא אמר רבא הכי קאמר מי שהיה כותלו כולי

Summary:
It is not understood why the משנה had to give a case where there was an initial wall; the same rule applies even if this was the first wall.

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תוס' ד"ה אבל

However, not because of the traffic - אבל משום דוושא לא

Summary:
We cannot answer that the משנה of חלונות is by an עיר ישנה, for a כותל בית is more like a כותל גינה, because there are items near the כותל which prevent דוושא, or there is not sufficient דוושא by a כותל בית as there is by a כותל חצר . Alternately we prefer the סיפא (and the subsequent משנה) to be like the רישא by an עיר חדשה.

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תוס' ד"ה וכמה

And how much; Rav Yeyvoh said, etc. - וכמה אמר רב ייבא כולי

Summary:
Sometimes the one who answers is the one who asked.

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תוס' ד"ה במדיר

Where he slants his wall - במדיר את כותלו

Summary:
A height of ד' אמות cannot ensure that in a perpendicular wall, the owner will not be able to bend down and look inside, even if the wall is ד' אמות higher than the windows.

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תוס' ד"ה והא אנן

But we learnt four Ahmois - והא אנן תנן ארבע אמות

Summary:
The משנה mentions חלונות, indicating that the distancing is not for דוושא.

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תוס' ד"ה לימא

Shall we say the Mishnoh taught anonymously not like Rabi Yosee - לימא תנן סתמא דלא כרבי יוסי

Summary:
All the הרחקות in this פרק are (even) according to ר"י since they are all considered גירי דיליה (even the case of דוושא), the only exception is אילן ובור.

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תוס' ד"ה כדי

So that he should raise up the ladder - כדי שיהא זוקף את הסולם

Summary:
If there was an unspecified agreement, the distancing required is ד' אמות.

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תוס' ד"ה והא גרמא

But it is merely causative - והא גרמא הוא

Summary:
The case of דוושא is also considered a גרמא and the גמרא there is not troubled by it!

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תוס' ד"ה זאת

This tells us that it is forbidden to cause indirect damage - זאת אומרת גרמא בנזקין אסור

תוספות discusses the difference between גרמא (which is פטור) and גרמי (for which one is חייב).

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