The Eagle Strike at San Marco Campanile was missed, so i found a way to remedy it
The Assassination Contract i used there is "Zero Tolerance", it seems the only one where you're free to move around the target, and it's the closest to San Marco (still 250+ meters).
There isn't much to explain there, i just grabbed the target without being detected, and moved him near the San Marco Campanile, at the west side. A smoke bomb to freeze him was not needed, the target was already unresponsive because of the waypoint separation.
This Eagle Strike required a manual aim, otherwise Ezio would automatically jump in one of the 3 haystacks.
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Zero tolerance has a literal meaning in this video as I try various assassinations in the contract.