Jarmel said:
In a very high traffic place? And all of a sudden the arms start to close?
Saren, even prior to becoming indestructible robo-saren, had the best gear in the galaxy, access to the geth armada and was fully capable of ruining anybody's shit. It is unlikely to have actually taken several minutes on that terminal, because he had like a couple of minutes head-start, and had to fight off security forces on the station, which I'm assuming didn't just let him go through with his geth army unopposed.
The terminal itself is approximately where the council chamber is, but spectres have full access to this (Shepard can walk up to it whenever he wants in-game if memory serves correctly). I somehow doubt that the security forces are going to shoot to kill on Saren for the crime of typing on a terminal they know nothing about, but even if they did it's not like he couldn't have a pack of mercenaries with him to just kill the security forces if they got suspicious. I brought a fucking KROGAN BOUNTY HUNTER to the council chambers.
Even if it was just Saren on his lonesome, what the fuck could C-sec do in the maybe 90 seconds they have to prevent the Reapers from returning? Saren dying after he's done his thing to the console is irrelevant because they need Vigil's data file to reverse it, and they
have never even heard of the Reapers before so why would they suspect that's what he was doing?
Shit, if this isn't feasible, then all he has to do is park some ship he has on the Citadel (full of Geth soldiers), then tell them to strike once he's in the council chambers, distracting security forces. At the same time, Sovereign and the Geth armada warp in to do exactly what they did in ME1 anyway, with Sovereign parking.
Or a less direct approach, Saren shows up to the council and goes "Dudes, I just found an
IN TACT PROTHEAN DREADNAUGHT!"
Then they sent science teams to investigate this marvelous beast. Any scientist who spends long enough to work out it's true origin (when they have no reason to suspect anything sus is going on ANYWAY) will get indoctrinated. Then one of them suggests letting it Park on the Citadel. Maybe the council can take it on a PR tour of Citadel space! Who knows?
Point is, Sovereign took the most pants on head retarded approach to his mission. With a little subtlety, he could have achieved it with no resistance, decades prior to when he did it in ME1.