The Arena, Boost Battle Challenge - Horizon Forbidden West

The guide uses the knockdown shot weapon technique.

You have to tag the adhesive sack so you know where to shoot after you knock him down.

Now ideally you want all of them to be packed near each other, so the explosion reaches all of them.

If you don't want to wait, just go for it anyway, but it's for the best if you get at least one.

Anywhere prepare the bow and knockdown shot technique - jump down and shoot the rollerback two times with it.

As he rolls to the side, you have to destroy the adhesive sack- all machines near the explosion slow down.

If you get all of them, just focus on the weak points and shoot them down. You should get all before the effect subsides, should some of them escape the effect, focus on him/them first, as the rollerback is slow either way, the battlefield should not be that chaotic.

After you destroy the spikes outs, the knockdown should be recharged quite a bit so again use the technique two times and as the rolerback is knocked down again finish him off.