Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
When hostile Spawn is spawning a creep, it can't be attacked, `creep.attack()` returns -7( proof: screeps.com/a/#!/history/E74S51?t=16674006 )
UPDATE: such a spawn still may be `dismantled`, but not `attacked`.