Perhaps the OP’s point #2 is referring to the Mishna in Sanhedrin 81B that states “HaBoel Armis Kanoyim Pogim Bo” (A Zelot may kill while the action is still taking place).
The Gemara elaborates on this concept and says we learn it Mediverei Kabalah from the Posuk Boel Bas Ail Naychor.
Shitas Rabbienu Tam and those that argue on him are located in
Tosfos Kesubos 3b Devirei HaMaschil (In the paragraph that begins) V’Lidrosh L’hwo.