Ashdid bi-ijtihādi al-ṭālibi is an indirect exclamation in the afʿil bihi pattern; the bā-phrase is outwardly genitive, and al-ṭālibi remains a genitive complement.
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Indirect Formation in the Second Pattern
The Two Exclamatory Verbs: Forms, Rules and Parsing
Ashdid bi-ijtihādi al-ṭālibi is an indirect exclamation in the afʿil bihi pattern; the bā-phrase is outwardly genitive, and al-ṭālibi remains a genitive complement.