Improved phrasing

Author: Froussios

Part 2 - Sequence Basics/1. Creating a sequence.md

@@ -97,7 +97,7 @@ Output
 1431443908375
 ```
 
-Notice how the two subscribers, 1 second apart, see the same time. That is because the value for the time aquired once, when the observable is created. What you want is for the time to be aquired when a subscriber asks for it.
+Notice how the two subscribers, 1 second apart, see the same time. That is because the value for the time is aquired once: when execution reaches `just`. What you want is for the time to be aquired when a subscriber asks for it by subscribing. `defer` takes a function that will executed to create the observable. The function will be executed for every subscription.
 
 ```java
 Observable<Long> now = Observable.defer(() ->