Blitzcrank is outdated.
Champions like 
for example, can just dash out of the pull, even though it hits them. Why?
2 Comments
because of the animation delay their jumps have
, , 
,and even 
, can all counter pull using a single ability its the way the game handles the ability info, yes it has to do partly with animation delay but overall its the order the abilities process that's important, mainly if you hit them before they use their movement ability they have only a fraction of a second to cast it before they are considered "pulled" vs them letting you pull them and then casting the ability or them just using said ability to avoid the pull altogether