Which technique is used in the underlined phrase in the paraphrased sentence?

Original sentence

Scientists also discovered a wound on one of his hands. This told them that he had likely been in a fight and that his enemies later chased after and killed him.

Paraphrased sentence

In addition, the discovery of an injury on one of his hands led scientists to believe that he had been in a fight before he was murdered.

$1.$Changing voice

$2.$Substituting word

$3.$Substituting word forms

$4.$Substituting phrase