This is how it sounds to me. A buyout has a specific meaning in business, but it can be taken over to the game scenario. The idea of a "forced/involuntary buyout" also comes to mind. "Capture and buy out" containes both aspects of the term.

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Note added at 5 days (2017-08-31 10:23:53 GMT) Post-grading
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Dictionary definitioni:
buy out
To purchase the entire stock, business rights, or interests of.
http://www.thefreedictionary.com/buy out

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Note added at 5 days (2017-08-31 10:27:14 GMT) Post-grading
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buy out (third-person singular simple present buys out, present participle buying out, simple past and past participle bought out)
(transitive, idiomatic) to purchase the entire stock or extent of something quotations ▼
(transitive) to purchase the ownership of a company
To close someone's contract by paying him or her a sum of money, the terms of which are often stated in the contract itself. quotations ▼
Usage notes
When referring to a property, the purchaser often desires to obtain complete control of a piece of real estate, or to purchase a neighboring property, often with the intent to develop the property by building a new or larger building(s), particularly with more housing units.
When referring to a share of a partnership or company, the purchaser is often buying the share of a spouse, other family member, or retiring shareholder.
When referring to a contract, the contract is typically for high ranking executives of a company, professional sports players, professional models, etc.

https://en.wiktionary.org/wiki/buy_out

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to buy somebody out

to buy a part of a company or building from someone else so that you own all of it:
Allied Chemicals have been trying to buy out their competitor's share in the target company.
http://dictionary.cambridge.org/dictionary/english/buy-sb-ou...