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The speaker, a 魔術者, is talking about the process of manipulating a man to do
something advantageous for the speaker. The exact particulars of how this was
done were never mentioned, it just was done.

> 実のところ、人を操るような魔術は複雑な精神構造に干渉しなければならないため難しく、正直あまり成功率は高くない。
>
> 成功率を上げるためには相応の時間や手間が掛かる上に、 **反動で大きな反作用を招いて** 術者にかなりの負担を強いる場合もある。
>
> 言葉による洗脳や肉体的な躾けの方が長期的に見て効率がいい **ぐらいだ** 。
>
> しかしこういう状況でピンポイントに使う分には、やり方次第で非常に有効だったりもする。
>
> 特にあの男は元々性欲や支配欲が強そうなので、その点を煽るような暗示は掛かりやすい。

...

For the sake of increasing the success rate, an appropriate amount of time and
effort needs to be spent, on top of that, "to produce a large reaction (total
guess)", there is often a substantial burden on the practitioner.

Brainwashing and disciplining via words is effective in the long term ぐらいだ

Though in this situation, for the purpose of a pinpoint dosage of
manipulation, depending on the method (魔術 or 言葉?), it is also extremely
effective (sometimes?)

...

There is definitely something that I am missing between the 2nd and 4th
sentences as a congruent thought process is not maintained.

  1. How is で used in 反動で大きな反作用を招いて and how does it work in relation to both 反作用 and 反動 in such a short span?

  2. This may be contingent on my lack of understanding of the 2nd/4th sentence, but I can't tell why mentioning the extent of ...の方が長期的に見て効率がいい is relevant in this context.

  3. Again this may be relating my misunderstanding of the 2nd and 3rd sentences. In the 3rd sentence, I have an issue with the disconnect between やり方次第で and ~たりもする. やり方次第で implies an outcome depending on the method but 有効だったりもする indicates a good outcome among other things. So does that imply depending on the method, it can also be not effective? Or what is the scope of this ~たり statement? In addition what is the also/も relating to then?

Thanks!
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2019-09-22T05:37:09.593
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2019-09-22T13:37:28.193
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question
reading-comprehension
反動で大きな反作用を招いて and how ぐらい is relevant in this context
For 1. This 反動{はんどう} describes mental state, a qualitative reaction. Working
on the magic towards others is stressful to the agent. So, an agent get "great
counter-action : 「大きな反作用」" by "the stress :「反動」" he/she feels.

This で used here is the following : 動作・作用の原因・理由を表す。「受験勉強で暇がない」「君のおかげで助かった」

For 2. I think "the direct method" : 言葉による洗脳や肉体的な躾け is effective in the long
term comparing to "the indirect method" such as the magic the agent is trying
to use.

For 3. _"So does that imply depending on the method, it can also be not
effective?"_

Yes, you are correct. It does not necessarily occurs to be effective. So, it's
lacking inevitability. But this time, since the situation allowing and the
point being pinpointed, it happens to be effective. This 「 **たり〜** 」 implies
surprisingly it occurs by chance. And this 「 **も** 」 soften the statement as
explained [here](https://japanese.stackexchange.com/questions/51841/usage-
of-%e3%82%82-in-a-specific-context).
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2019-09-22T10:47:05.110
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answer