Question about 24v reverse protection circuit on switching diode

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ir_tronik

Joined Jul 12, 2017
16
Hi, Im designing a 24V reverse battery connection based on article from Analog devices:
https://www.analog.com/media/en/technical-documentation/application-notes/AN-171_AN-1568.pdf

So at the last page, which is the circuit below:
1641788008108.png
Could someone explain to me what is the meaning of:
"D2 prevents MP3’s gate from pumping below ground, and the battery charger output with it, when a reversed battery is hot plugged."

Im not very clear and understand about the meaning of it. Thank you for helping me
 

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