How would the police/military prepare and fight magicians? was closed as story-based and subsequently edited. It looks to me like the OP is asking about tactics and capabilities, not character actions. Can it be reopened now? If it should stay closed, what further changes are needed?
Most of the edits have just been appended to the end of the text. The original question is still there.
How could the police and later the military prepare to find and, more importantly, fight these two?
This is asking how would people respond to a scenario. This is why I voted to close the question.
The edit added two additional questions.
Are there rules/standard tactics for dealing with unknown threats? What kind of gear/weaponry do police/military forces have access to and which of these would be appropriate/useful against the described enemies?
There are multiple questions being asked at once. Asking what gear would be useful feels like a mixture of too broad and too opinion based to me. Asking are there tactics to deal with the unknown is a question wrongly asked. You can't really have rules or equipment for dealing with the unknown. The same way you can't expect the unexpected.
None of these questions are good questions for the site and the one that is most acceptable (Are there tactics?) isn't supported by the rest of the text. If this is the question they want answered they would need to reedit their entire question to focus on this and not the magicians.
I think this question can be reopened, but I would like it to be reworded a bit to put the actual question content higher. To make this a good question, the focus needs to be on "how do police deal with threats they've never seen?" That is actually I think a really valid world building question. The majority of the post should come later, for it's simply context describing just how unusual these two individuals actually are. I shouldn't have to read through three paragraphs of flavor which has minimal impact on the question before finally arriving at the question in the last sentence. It's just presentation changes.
If phrased this way, I think this question is not a duplicate of the military one. The military and police have very different approaches. I might even be tempted to say that if I saw a question that asked for both military and police responses, I'd close it as "too broad." In particular, the military is typically in a position where a response is required because you must change the world around you. The police get more opportunities to instead regroup and simply hold the status quo until the correct time to strike.