It is, perhaps, more accurate to say that they haven't had anyone hunting them who has an assassin's skills - with SHIELD believing Dreykov dead, the worst the Widows have had to deal with are local law enforcement, easier by far to evade, and not nearly aware enough of what they're dealing with.

Then, too, there is the fact that while they're valuable tools, they're also considered disposable. A Widow who has been caught is typically a dead Widow, unless she's cut off from all communication with the Red Room before she has a chance to act.

Dropping Yelena first is a good idea, for more reason than one.

Still, it takes some time before an opportunity presents itself. There's no good angle on the space she uses for her work - she's several floors up, but that's no excuse for leaving any documents where a casual glance through a window might spot them, even when they're carefully stowed away while she's not actively working.

Eventually, though, the noise from the laugh track in the living room grows annoying. Yelena shoves away from her desk, and crosses the room towards the nightstand where she's left her ipod. It isn't a long window of exposure, just enough for her to pass by the window, there and back, but given his skill, it's certainly enough.