It seems very unlikely that it wouldn't occur to either silver or Haddock to sit there doing nothing when they could have Tracked or Roleblocked someone.
You're still not making sense. What have you done with faust?
Each player may only gain one single mafia-game action shot (e.g. cop, doctor) per Space Phase (not per round). Subsequent attempts to gain any type of shot will be treated as a failed card action.
You can certainly still try for both...
In particular let's suppose players 4 and 5 both happen to go for Weak Visitor...
If they both do nothing for 2nd round and weak visit round 3 we get only a single visit from 4.
But if they both try to weak visit on both rounds 2 and 3 we get 2 weak visits.
Similarly if scum blocks the round-3 action, but fails to block the round-2 action, then if you take a null action you achieve NOTHING, but if you try twice you actually get your action off.
In both of these cases the difference between trying once and trying twice is that we get an extra pro-town action out of trying twice.
People should be trying to get something out of every card play, especially if you have a glut of a single action-type (which you did). There is abosolutely NO REASON for you not to have tried twice night 1 for weak visitor. And no reason for Haddock to do the same.