1)
TOSFOS DH AVAL
תוספות ד"ה אבל
(SUMMARY: Tosfos explains why Rebbi Shimon would agree to Rav Chisda's statement despite a previous leniency.)
אע"ג דמרבץ שרינן לרבי שמעון (לעיל דף צה.)
(a)
Implied Question: This is despite the fact that we said earlier (95a) that Rebbi Shimon holds it is permitted to put water on the floor to stop the dust from rising (and we do not suspect he will intend to smooth his floor). (Why do we suspect this here?)
הכא רגילות הוא להתכוין לאשוויי גומות וחיישינן טפי שמא יתכוין
(b)
Answer: It is common for a person to intend to smooth out the holes in the floor, and there is great reason to suspect that this will be his intent.