When initially assessing a closed door, what indicator suggests that a possible victim may be behind it?

The presence of resistance felt while opening the door can indicate that a possible victim may be behind it. This resistance may suggest that a person is trying to prevent the door from being opened, possibly due to being trapped or in need of assistance. Additionally, if the door is hot to the touch, this could further indicate that there is an active fire situation on the other side, and any person there might be in a critical state, requiring immediate rescue.

Regarding the other options, a warped door could result from heat exposure but does not specifically indicate that someone is behind it. Visible light through cracks may suggest that the area is not completely sealed, but again, it does not confirm the presence of a victim. Similarly, unusual noises might imply activity, but they do not guarantee that the sounds are coming from a person needing help, as they could also originate from the environment or other sources.