Don't Walk Into The Bubble, AK!

When a shield around a confinement sudden collapses the decreasing $\psi$ sends its content into the future.

Earth is revolving around the Sun.  The temporal differential results in a spatial shift.  If the shield envelops a whole city then, the city is shifted in space as the result of a shift in time because earth is in motion.

The collisions between the area outside the shield and the area shifted in time and space within the shield will be a catastrophe.

In a similar way, if $\psi$ is allowed to build up engulfing a body, the body will be sent back in time.  When the spatial shift is significant, there will be destruction inside the shield outside the area of overlap.

Strengthen the $\psi$ shell after its build up and let the shield weaken without collapsing the $\psi$ shell.  This way, the temporal force that results from changing $\psi$ with time is minimal.

Don't walk into the bubble, AK!