2kewl4u said:
Maybe he wasn't sure whether they had another ace up their sleeves and just observed for the time-being. Once Vegeta defeated #19 he saw he could take them.
Doesn't that imply he's weaker than the expected Androids?
ahill1 said:
Being confident in his abilities doesn't mean that he thinks he can swat #20 away instantly. So playing dead and getting to #19 quicker would be better than possibly engaging into a battle with #20 (he still didn't know #20 was weaker than they thought) and risking having Goku killed by #19.
#19 was already killing Goku while he was having a heart attack. Lying there in the ground is a even worse idea than engaging them given the amount of time he'd waste waiting for an opening.
And given how he took on a far stronger #20 easily, i doub that Initial #20 would last more than a few seconds. He also could've charged to #19 to save Goku instead.