Talk:Katarina/Strategy/@comment-195.124.137.164-20111121101137/@comment-190.177.199.24-20111128192934

Summoner spells doesn't count toward skills used: Using summoner spells won't count, let's say, for charges on Archangel's Staff or Tear of the Goddess. If you read the later's description, it says "Every time YOUR CHAMPION...", meaning that YOU, as a summoner, are on the fields like some sort of god casting spells to help your CHAMPION.

TL;DR: If YOUR CHAMPION casts a skill, it is interrupted. If THE SUMMONER casts A SUMMONER SPELL, it doesn't get interrupted. Although it is better to cast exhaust, close the gap, use ulti and get the kill. If you have Rylai's by then, the slow will help you ensure you get the kill.