Angels are famous for crashing games! They are just that powerfull. They usualy will crash your game when they fire the Fiery slow moving death ball the red and orange one

This one emits a shit ton of light! That's the problem. At Post Office it lights up the whole office area you can even see a bit of the light thru the ceiling tiles! Problem with that is Unreal Tournament on some maps gets really pissed off when too many surfaces in a map are lit up at once and instead of when a certain amount of surfaces are lit stop or logging a warning, it think it will be more awesome just to crash.
Angels and everything else and Max's use to crash players on a regular basis almost every time you encounter one in some maps! However long while ago I put in a safeguard so the light would not light up too many surfaces.. it was not perfect but it reduced the crashes BIG TIME to the point where its a rare even.

in the Green balls code is this
simulated function BeginState()
{
LightRadius = default.LightRadius*u4egauntlet(Level.Game).
SafeLightScale;
Velocity = vector(Rotation) * speed;
rring=spawn(class'BFGRotRing',self);
SetTimer(0.2,true);
}
}
However I must have slipped up because it seems thats missing from the Solar Blast orange red sun death ball thing
function LightStart()
{
LightType=LT_Steady;
LightBrightness=255;
LightSaturation=255;
LightRadius=255; bFade=true;
}
That will fill the map up with game crashing light!
The solution is to add the safe light scaling to the other lights too.
includeing the purple flash the gates make when there destroyed I'm not sure if that has it either
In the meantime to all players that are having a really hard time you can turn Dynamic Lighting off in options that will get rid of the light but I would only do that temporarely and under extreme conditions like your crashing several times in a game non stop
Instead of shutting down your PC, If your PC is locked up by UT or task manager opens up behind UT and you just see it flashing thru
Press Windows+L
that will lock the computer which will force UT to minimize giving you control of your pc again just log in and then use taskmanager to terminate ut