[Tifone]

Sounds more realistic on 1vs1 attempts, but you can expect the eventual bodyguards of the target to be always alert about the surroundings of their protected one. A doubtful matter. I would probably like the way you suggest better, though, as even if the guards are alerted the assassin would be readier than them and make the first move (getting closer to the target, firing an arrow or a spell) anyway when discovered after all.