In Japanese Ikazuchi is 雷 and Inazuma is 電, very confusing. Moreover, damaged Exetor, escorted by Encounter and Pope, was attacked by a group of Japanese destroyers including both Inazuma and Ikazuchi. I am sorry that I have no authoritative data.
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I found the book in question and it was me that is confusing. Thank you very much for your correction. The author of the book on this topic, Megumi Ryunosuke is a retired lieutenant (junior grade) of maritime SDF. He made interviews to the crew of Ikazuchi and Inazuma, and also Exetor. His book is very persuasive.
http://www.soshisha.com/book_search/det ... 14995.html
According to Japanese record, in March 1, Exetor sank at 12:50. Japanese force left Inazuma for the rescue of survivors and the rest chased two destroyers.
Encounter sank at 13:30 but for the day Japanese forces deserted her. Pope barely escaped but soon aircraft found her and bombed. Japanese destroyers caught her up and sank her by gunfire nearly 16:00.
Next day morning, Ikazuchi found the survivors of Encounter by chance. They were covered in heavy oil and weakened in twenty hours' drifting.. Kudo ordered to save them. The board was occupied by sailors, and all hardpoints became unable to use. His HQ was not pleased to hear it, but anyway Ikazuchi saved 422 men dispersed in large area. Megumi do not explain why, but in 422 men the skipper of Exetor and some crews were included. Perhaps they moved to Encounter just after Exetor was sunk.
It was Ikazuchi that found the survivors of Pope first, but the crews refused to board Ikazuchi and requested to tug their boat. Kudo refused it worrying about allied submarine and let them alone. After that encounter Inazuma again found them, and exhausted crews boarded Inazuma this time.