। ॥ २३९ ॥
In plain words
Śiśupāla goes down into the ford of a great battle with his eyes on Hari, and sinks. To that very man the Lord gave sāyujya on the spot, merger into himself.
Close to the Sanskrit
Through the conjunction of beholding Hari, the Caidya plunged into the ford of the vast battle; to that very one the Lord indeed gave sāyujya at once.