They could have moved with #16's pod me thinks. Either that, or they protected it with their own bodies, dunno. How are their clothes? #18's clothes were at least jagged up after Vegeta's blast.
As for #18 defending herself from Trunks' sword with a single arm ever so nonchalantly... well, I think that's kind of a combination from both. Vegeta is noticeably above Trunks and #18 was putting up more effort upon seeing Trunks butted in. Piccolo seemed to imply #18's stamina was the main factor involved there that would lead Vegeta to his downfall, which to me implies that #18 (vs Vegeta) was around Vegeta's powers, something that seems iffy considering statements dished out after the fight. There's also Trunks apparently only noticing present #18 was stronger than her future self upon fightng her, whereas beforehand, when she was fighting Vegeta, he was only impressed by Vegeta's ability to fight on par with her, which to me implies present #18 was still holding back to a similar level of that of the future androids, and then decided to use her full power upon seeing Trunks was about to attack her, or something close to that.
Present #18 >> Present #18 (still holding back) ~ Vegeta SSJ ~ Future #18
I know that #18 stated she wouldn't hold back anymore, but if there're later implications implying she did, then I'd rather go that route. Similarly, Roshi in the 22nd Budokai stated he'd be now serious against Tenshinhan, yet according to this latter Roshi still didn't give his all... so there's still ground for a character stating they'd be serious and yet be holding back somehow, much like Goku in his fight against Kuririn in the same Budokai.