Tip - Keeping Dekker alive:
you'll often face situations like this one:
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It is the Spiders turn, the enemy will activate first in the next phase. The Shadow Hawk is damaged. It is tempting to use the Spider offensively and try to kill the Shadow Hawk. Don't do this. Not if you want to keep your light mechs. Even a badly damaged Shadow Hawk can kill most lights with a single punch. Or cripple them with an Alpha Strike.
Now in this special situation you could use the aforementioned precicion strike with the spider to lower the SHD's initiative and gang up on it. But if you can't kill it your Spider will pay the price. The smart move is to sprint or jump away into safety and let the better armored lancemates take the damage.