If you hear 给雷暴, this usually means that they will use Detonate for Poison Wall. Some priests cannot Detonate precisely with Spirit Boost, so listen carefully for if they want Spirit Boost. 不给爆发 means not to give Spirit Boost for Poison Wall.
The scorpion has a 90% chance of charging at the party right after it emerges, so don't hurry to move over to it's location. The charge is a very high priority move, it will use it even if it walks to your party, so do not commit to moves that take too long, it might shift it's location, causing you to miss.
With the current DPS levels, it is very possible to not see Poison Wall at all. There are some very important points to take note of for this battle.
- Time Acceleration is often given at 3X. The goal is to push the Scorpion from 3X to very low HP values of 2X, then finish it in 1 wave after it emerges without seeing Poison Wall / Poison Spin EX at all. This is also important for Time Acceleration cooldown (in order to 1 wave Sandworm)
- Spirit Boost timing I use, start of battle once, and once just BEFORE the Scorpion emerges at 3X. Make sure you can evade the stomp... This is to allow everyone to catch up to the Scorpion and DPS a bit (basically so that everyone can gather quickly enough for Time Acceleration). When the Scorpion digs underground, DO NOT STOP DPS-ing, it still takes damage for some time! Avoid the use of any skill that can shatter the flowers of course. If the Gladiator is geared enough (usually they are), the battle will be over soon enough, right after the 1X emergence stomp.