Okay, time for the crab things.
Well, first thing first, Masec, Nero, and Sam takes some more acid damage, the same amount as last time (8 for Mesec, no damage to your armor as this is simply the acid burning your soft tissues now, 4 for Nero, and 2 [1 if dove for prone?] for Sam).
The crab in front of Trudy is getting frustrated with that tasty piece of metal that won't just become lunch, so it will try and bite Trudy twice. The second crab, seeing the effect of its acid blob, will move in for a bit on Mesec.
The second bit hits on Trudy, who can attempt to Dodge (with appropriate M-A penalties), as well as Mesec who can also attempt to Dodge with his full AGL since he hasn't acted this round (Edit: LOL!, seeing the damage I rolled, Mesec could just let the thing bite him, it wouldn't bypass his ballistic suit's DR!).
Rolls
2 bites on Trudy (45%, 25% with M-A penalties) - (1d100, 1d100)
1d100 : (52) = 52
1d100 : (21) = 21
Bite on Mesec (45%) - (1d100)
(12) = 12
Damage Trudy - (1d10)
(3) = 3
Damage Mesec - (1d10)
(1) = 1