The 10% refers to the VWAP on the 1st trading day AFTER the announcement e.g. an announcement at 8am (on a trading day) means the reference price is set on that day. BUT an announcement at 5pm (on a trading day)... means the reference price is set at the end of trading on the 1st trading day AFTER the announcement.
Greedy when others are fearful,Very fearful when others are greedy - to paraphrase WB
Greedy when others are fearful. Very fearful when others are greedy - to paraphrase Warren Buffett