You’re correct, @trubandloki .
The subpoena issued by Deininger to KK has nothing to do with defending Barisone against LKs suit for injury.
The subpoena issued by Deininger is related solely to Barisone’s counter suit, as opposed to his defense against LKs suit.
It seems likely that collateral estoppel will apply to the issue of whether Barisone shot LK.