Second...

...you will come to the lake at regular intervals...let's say once a month, to report on your situation.

The night of the full moon should suffice. You'll be difficult to see at night, and the circumstances will be good as a landmark.

We will shift the time axis and attempt contact each month...

...but if we sense any trouble at that point, we will have you return immediately.

And third...

Even we can't tamper with the barrier that often.

After three more times...

...that is, in three months, no matter what the situation, you will come back. .... Is that clear?

.... Understood.