I see sysops activating/deactivating/reactivating ICE to react to various runner tactics. Perhaps a program isn’t stopping the runner(s) so the sysops pulls out a different gun, so-to-speak. Basically, a digital Pokémon battle.
As far as reactivating ICE, might that be for ICE a runner disabled for the whole run? The runner defeated the ICE but the sysops reboots it? If reactivation is automatic and disabling it is the result of a dynamic between the runner and a program, then it should stand to reason a third player (the sysops) can reactivate the disabled ICE (I assume the ICE isn’t completely destroyed). The ICE being disabled for a run, to me, assumes a sysops isn’t getting involved.
What’s interesting is the constant battle of melting ICE that’s continually popping back up, the runner having to make the call to keep it at bay, disable it, stymie a trace or find juicy data, etc. I picture it like trying to swordfight while searching a book for some secret. Not easy but oh-so awesome.