I was only able to intrigue it once, at the very very start of the fight. But I did see it get intrigued that time, and I guarantee that wasn't any weapon skill of mine. Don't know if it was Fodder's Coronach though. However, neither Habil nor Sarahlynn are in Fiko's alliance here, yet you can see their chat log messages. So, he could see everyone's weapon skills if they used them. So I think the only weapon skills being used there those 2 Dagger weaponskills.
If we ever do this again, I'll save my first WS until about 10 seconds into the fight. No point intriguing it right off the bat. Also good would be to have like 4 SAMs in my party, and set up a Shikikoyo order. This would essentially let me spam Mercy Stroke throughout the entire fight, as soon as I use it the next person gives me 100 TP and I use it again.