Double Shift Groot walls very fast?

[100%]

I keep noticing groot placing his thornshlash walls quickly side by side perfectly spaced out to form a large wall, How are these players doing this?

[Janitor]

Hold your mouse when placing

[100%]

Originally posted by Janitor:

Hold your mouse when placing

you're a legend, thank you

[SegaSunset]

Not only is that a neat trick, but you can also use your ult on ceilings and walls to compliment your thornlash walls placements