If you’re going to get swallowed by a dragon, make sure the dragon has some fire. That was the case Wednesday when Vancouver-based interactive marketing firm Blast Radius was bought by international conglomerate WPP. Whereas Blast Radius had good numbers — 350 employees, six offices in four countries, and revenues of $41.8 million Cdn in 2006 — new parent WPP has more than 100,000 employees, 2,000 offices in 106 countries, and 2006 revenues of $11.7 billion Cdn.