With intense ardor (samādhi) is very close
This sūtra has two words, tīvrasamvegānām and āsannah.
The first word tīvrasamvegānām is the sixth case plural form of the term tīvrasamvega. This is a compound of two component words tīvra and samvega. Tīvra is an adjective which means intense, keen. Samvega is formed from the prefix sam with the verb vij and the suffix a. This noun means vehemence or ardor. Tīvrasamvegānām, for those with intense ardor.
Āsannaḥ is the first case singular form of the word āsanna. Āsanna, the noun is formed from the verb sad, prefix ā and suffix a, meaning very close.
Regarding the question as to what is close, we have samādhi, a word drawn from a prior sūtra, by a process called avuvṛtti , well known in analysis of aphorisms to figure out the meaning .
Vyāsa states in his commentary that this result of ‘intense ardor’ applies both to achieve samādhi and to gain the result of samādhi.