So far I've tackled all other proving grounds successfully (well, haven't beaten the shield one, but I understand the technique on how to do it). However, I can't really understand how to complete the machete challenge on time.
I kill all towers and spawners quickly, and I take down all the aggressive Squirts quickly, but the coward squirts keep running away from me, getting off the platform, so I'm forced to shoot them one-by-one with the machete throw, which is a slow and inaccurate business, I'm not even close to the 2nd prize.
What technique am I supposed to use to solve this? Do I have to wait until I unlock some cool machete upgrade, first?