Passive - Spare Tire: If a mafia player is killed by any means, you will gain another tire. This tire can either be used for your Road Rage ability, or to passively save yourself from harm (lynch, nightkill, or daykill).
Now just a stupid theory maybe but what if Cat5 was the one to attack Voe N2?
For N1 it wasnt possible as his ability might have backfired and hit HIMSELF which is why we saw no killing role visit cat5 as he attacked himself.
Triggering his own Morpho field, he returned and was able to use his ability once more on someone else?