All warrant exercises prices can be manually reduced by the company, therefore this clause is not explicitly shown on the DT site under the price protection field.
The company may choose to reduce the exercise price below the current stock price in order to entice the holder to exercise, which allows the company to raise some short term funds if they are desperate for cash. In some cases, more warrants are issued as a bonus to further induce the holders to exercise. The market impact is a one time drop on the announcement of the exercise, much like the result of an offering.
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