(Perhaps a bad title, and perhaps a bad placement)
So I was looking through my phone photos and found this sitiuation (this is only bart of it but still)

Click Here To Show Diagram Code

[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . O X X . . . . . . . . . . . . . . . |
$$ | . O O X . . . . . . . . . . . . . . . |
$$ | . X O X . . . . . . . . . . . . . . . |
$$ | . Q X X X . . . . . . . . . . . . . . |
$$ | a . P X . . X . . . . . . . . . . . . |
$$ | P P P X X X . . . , . . . . . , . . . |
$$ | P X X O O X X . . . . . . . . . . . . |
$$ | X X . O . O X . . . . . . . . . . . . |
$$ | X . X O O O X . . . . . . . . . . . . |
$$ +---------------------------------------+[/go]

(The wall continued up. This was a handicap game where I had a big one as most of them)

If it is Blacks turn, playing A would kill the X marked stones and depending on answer also the triangle. (He could save that by taking the ataried black stone while the other four stones are lost?

Am I reading this correctly?

I did play wrong however as it ended in one giant section beeing in Seki in the lower left corner.

It would also kill the white group too.

Yes. This is variously called Oiotoshi, or Connect and Die, or 接不归.