The word śālā at the end of a tat-puruṣa samāsa when exhibited in the Neuter has acute on the first syllable.,
Thus ब्राह्मणशा꣡लम्, क्षत्रियशा꣡लम् ॥ The compound becomes Neuter by 2.4.25. Why do we say \in a Tatpurusha\? Observe दृढशाल ब्राह्मणकुलम् which is a Bahuvrihi compound and therefore first member retains its accent (VI. 2. I), and as the first member is a Nishtha word, it has acute on the final. Why do we say \the word शाला?\ Observe ब्राह्मणसेनम् ॥ Why do we say 'in the Neuter'? Observe ब्राह्मणशाला ॥ Compare 6.2.86.,
