Earlier quoted context omitted.
I think he's saying that sometimes it is necessary to take action before a conviction in a court of law. If I see you about to stab someone I'm not going to get a police office to review the case, pass it on to a legal team to assess and bring before a judge, wait for a subpoena, wait for legal representatives to make submissions and then have you arrested. Instead I'd do my best to stop you stabbing them. Sometimes…
I suppose he's saying a number of things... But none of them relate to your example. Statutes exist to allow people to take emergency action when a crime is in the process of being committed - but they have no relation to civil forfeiture, which isn't about stopping an action but to remove peripheral resources permanently.
Shutting down hott_kiddie_porn_pix_4_free.com is quite different from impounding someone's car or putting a lien on a bank account. Please stop arguing with me about the latter when I have only ever been talking about the former.