I already received the critical reward of killing more than 40% of the total number of killed monsters. I can easily perform a deflect critical or also a issen (sometimes)but there are 2 things that i didn't get in this game: ten point slash and a uknown critical that could even be the ten point slash. Can somebody tell me (please explain exacly what i must do to perform it)how do I perform a ten point slash?
The other question is about a uknown critical that I've performed sometimes, including in bosses like Guilderstern. When I was killing Guilderstern for the second time I performed a strange kind of critical: my weapon was charged and I performed a normal issen in his (Guilderstern) 2 summons, then Samanoske killed both of them (summons) and hit Guilderstern lot of times, like a critical. What was that? Does somebody knows?

TEN POINT SLASH : Hold L1, then press up and action button at the same time, then press action button every 0.3 second.

Series critical: at normal status, you can critical for three times, also, start critical then press action button every 0.3 second. However, when your weapon is charged, you can perform 7 criticals, as long as there are enogh enemies for you to critical. This is called, series critical. I call it myself, i am a Chinese, dont know how to translate it into English.

what does the ten point slash look like because i've never seen it done and i cant find a video on youtube showing it specifically