And honestly, I'd see it as being more like when more powerful ones show up, Yuber would summon a few more powerful monsters to deal with them. He wouldn't know who the general is unless Albert very specifically mentions that, but seeing the General take out like the Bone Dragon with no issues by himself would be enough for Yuber to say screw that and let the humans go after him and die.
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And honestly, I'd see it as being more like when more powerful ones show up, Yuber would summon a few more powerful monsters to deal with them. He wouldn't know who the general is unless Albert very specifically mentions that, but seeing the General take out like the Bone Dragon with no issues by himself would be enough for Yuber to say screw that and let the humans go after him and die.