Advanced Flash Tricks
Not sure if these are all well known
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You can flash right after you cast certain skills so your enemy has less time to respond. It will also redirect your skill. Video of skills you can flash
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In many cases it is better to put in a command such as: Using Annie and pressing Q on a target then flashing instead of flashing and using Q because with the 2nd option we always have a slight delay.
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Finally, you can increase flash range a lot by flashing inside walls.