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The full dialogue in the light novel is:

> 「だが注意したまえ。白峰は聡い男だからネ。何かしらの **手は打ってくる** だろう」

The characters were discussing about some operation.

I'm not sure of why the author would use the particle は here instead of を.
[From another post on the usage of
何かしら](https://japanese.stackexchange.com/questions/25238/how-
should-%E3%81%8B%E3%81%97%E3%82%89-be-used-in-the-middle-of-the-sentence), I
have taken it to mean "some kind of", and in this case, would the sentence
mean that, "as for some kind of measure, I think he would strike us" , but as
[this comment has
shown](https://japanese.stackexchange.com/questions/25238/how-
should-%E3%81%8B%E3%81%97%E3%82%89-be-used-in-the-middle-of-the-
sentence/25240?noredirect=1#comment54650_25240), if を is used instead, then it
might mean "I think he will use some kind of measures towards us."

Can someone please clarify the usage of particles in this context?

Edit: [A further comment from the above mention
commenter](https://japanese.stackexchange.com/questions/25238/how-
should-%E3%81%8B%E3%81%97%E3%82%89-be-used-in-the-middle-of-the-
sentence/25240?noredirect=1#comment54654_25240) explained that it might
originally be をは but the を has been dropped by the author to make the action
itself be the topic instead.
CC BY-SA 3.0
2015-06-22T13:38:06.867
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question
grammar word-choice translation
How should 手は打ってくる be translated?
As I posted on a previous comment, to my understanding を is omitted because
the action of "taking measures" needs to be qualified as the topic. There is
also a great answer from Derek Schaab about particle omission here
<https://japanese.stackexchange.com/a/3152/4419>.
CC BY-SA 3.0
2015-06-22T13:50:41.907
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2015-06-22T13:50:41.907
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answer
Compared with 何かしらの手を…, using は conveys a sense of "at least".
CC BY-SA 3.0
2015-06-22T21:00:42.973
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answer