[If it had occurred to Thane that he and Shepard might be from different points on the timeline, he may have taken her behavior for more than simple gratitude.

But it doesn't, so he doesn't -- at least not yet.

He focuses on the flood again.]

We need to find the water's source. There may be a way to shut it off, or at least slow it down.

[They could buy some time for survivors to evacuate, what few there probably were. The water had come on so fast that Thane doubted most people even had time to react, let alone climb to safety.]

Failing that... well, there are the barriers.

[Impenetrable wall vs Commander Shepard? His money's on Shep.]