[ SPOILER ]
Thank you for the sweet comment! Initially, the story was planned to have two endings (and two other extra plots), but time wasn't on my side. The only noticeable difference is, if you choose to attack the guard you will be provided with the option either to hide the body or continue with the mission. If you didn't hide the body, upon leaving the building, there will be some guards outside and the team will be shot at, one of the bullets hit Sarif on his shoulder. However, this still doesn't change how the story ends, it just a bonus scene.