an easy way for a blinking sprites/lights with different timings
i.e a sprite on constant to a sprite on blinking then back again
set up two sprites/lights in the same place with the same attributes apart from the appearance (i.e one constant and one fast strobe etc)
then when you want the sprites/lights to change due to say the change from build to fight mode.
Game logic timer
on build:constantlight/sprite enable/on
on build:blinkinglight/sprite disable/off
on fight:constantlight/sprite disable/off
on fight:blinkinglight/sprite enable/on
an application of this would be putting blinking sprites or changing coloured lights for say fight to build ie green to red on gates or in bases.
In a map im making at the moment an electric fence separates the two bases. Trigger hurt brush on the gate enabled during build then disabled during fight.