Why is «وَمَا أَدْرَاكَ» an example of madd munfaṣil?

Al-Māʿūn and Al-Humazah: Applied Assimilation, Concealment, Madd and Hāʾ Rules

• Alif and hamzah are in the same word
• Stopping creates a permanent shaddah
• Nūn sākinah meets bāʾ
• Madd alif is in one word and hamzah starts the next