Hi, In both sentences, the subject of killing is understood to be the fire . SJD87
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AnonymousThe fire destroyes hundreds of houses, killing tens of people.
AnonymousI don't know when the subject of the present participial is The user or the key. We need to use the comma to distinguish them, don't we ?The user did the erasing; the user is the subject. The comma helps us to see this, though not everyone is careful about the placement of commas, so you will see some variation in the punctuation.