I like playing against bots to practice last hitting, but it's hard to do that when the bots spam their auto attacks and push your lane to your turret, forcing me to also spam my AA.
Since bots have the most perfect timing, playing against an opponent with a 100% last hit rate would be excellent practice!
Practicing last-hitting while you are pushed to your tower is better practice
Next you'll be complaining about the bot you're laning with taking all of your CS
It's harder to last hit under a tower and get them all. So therefore its better practice. That or learn how to freeze your lane.
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