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From the information you have given above it is completely understandable to have a character like that in the first scene. Passiveness can be state of mind given a period of time. Now as you menti...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/19066 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
From the information you have given above it is completely understandable to have a character like that in the first scene. Passiveness can be state of mind given a period of time. Now as you mentioned evacuation you can describe the scene and other people's reactions and how your protagonist is immersed in these things and so decides to have no personal goal on his or her own. You could describe his or her panic and the sense of alienation or anything you feel relevant that you can flesh out in the plot later on. There is no need for the character to always be active as in deciding an activity and they can be pretty passive. However, passivity as in complete inertia is pretty traumatic or well not believable and somewhat denies the character a basic human trait so I would avoid that entirely.