Paul Grogan said:
ok, I get it now.
In order for Wyrm to use the ability that reduces the strength of ICE, it needs to be able to interact with it.
So, if Wyrm comes across Enigma (Str 2), I need to boost Wyrm by 1 to Str 2 before I can then use ability #2.
So if I also have Crypsis installed too.  I can then spend 2 credits to reduce the ICE to strength 0 and then 1 credit to break.  Yes, I know I could have just boosted Crypsis to strength 2 and broke for the same cost…

Exactly.
Also, remember Parasite trashes ice when it gets to zero strength -- a Runner using both (most likely an Anarch) could expedite that crash.