What do you think are the implications of the words ‘unlocked’ and ‘connected’?

We watched it apart, and perhaps that was my mistake,
letting the half-darkness fall over you in the city,

while I traced its spreading hand across the fields,
following the rooks, flying in threes to roost.

But as the sun became quarter, then half moon,
it unlocked in me, and I saw us connected again,

by the day’s slowing to monochrome, by the mid-day midnight breeze
and by the moon’s shadow passing over and between us.

What do you think might have ‘unlocked’?
Why do you think he feels ‘connected’ to the other person watching the eclipse?