@Mex - he died because at the same time he planted the Storm column.
@Stealth - it was calculated move because scrin's early game is poor, and having all my harvesters on one tib field keeps them safe from early seeker harrasment, not to mention how just several predators along with few rocketmen can repell much larger seeker force so there wasn't any risk involved in fast teching on this map - it's not like I was defenseless.