Why is the hamzat al-wasl not opened when beginning?

Machine translationRead the Arabic original

The student: ...the hamzat al-wasl

The Shaykh : No, this is the language of the Arabs: the hamzat al-wasl, when one begins with it, is kasrah (voweled with a kasrah).

Source alathar.net

The Arabic text is copied verbatim from the original source, without any edits.

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