» Wed Mar 30, 2011 4:18 pm
You can use the "I'll see" line with Hardin with no ill-effects, but if you fix the vents and then talk to Hardin about replacing McNamara (which means you have already done the optional stuff to find out how) before you accept the last quest from McNamara, you glitch both NPCs into an error state; as a result, neither of them will offer the dialogue for the appropriate next step which means that Hardin will not move to take out McNamara nor will the latter ever offer the last quest for initiation into the BoS.
In order to get the last quest from McNamara you need to not talk to Hardin after fixing the air filters, then leave the bunker completely (i.e. exit to the Mojave Wasteland) and go back inside. This will enable the dialogue from McNamara in which he offers initiation into the BoS even though you have not given him the 'couple of days' supposedly required to wait to get it.
Fixing the vents means you side with McNamara by default; the glitch occurs when you attempt to get Hardin to throw him out, since at that point you aren't still supposed to have that option. Since you talk to Senior Knight Lorenzo about the vents prior to reporting to McNamara, there's a window where you have an opportunity you aren't supposed to to still turn on him by talking to Hardin and this is what causes things to glitch out as the quest script does not actually lock the latter option out until you talk to McNamara after telling Lorenzo about fixing the vents.