Is burn only used when a drone is in motion?
if a beholder has 1 burn and it says it needs 2, what happens if it has insufficient burn, does it not activate or activate where it's burn expires?
does a beholder die when it's burn expires? does it's burn measure anything with relation to it's glow lingth?

Burn is the number of turns before the fuel runs out. The drone then implodes if it has not reached its destination.

Beholders radius = the radius that is illuminated.