Discovered by: Fano7
When it's stomach is vulnerable, you can hit it with 6 bombs, instead of 3. To do it, you lay 3 bombs as normal. After they explode, lay 3 more. You have just enough time to get the extra 3 in. But be careful, because the Korakk will start to move as you lay bombs 4-6.
Discovered by petrie911
When he gets up from being bombed/shot in the stomach, he usually opens his mouth very soon after, so with quick fingers, you can immediately stun him and start bombing him again.