All evidence posts to Krillin getting completely washed. It took everything Goku had just to kill him while Krillin was handled with kid's gloves by the same Goku who wasn't using his full stremgth.
They were only giving Goku problems because he already lost all his energy fighting Cell and Cell himself said they were barely above Vegeta or Trunks.
SSJ Gohan should be able to stomp the lil buggers regardless.
Krillin didn't believe he was stronger than the bully till he was, so he feared him for a reason.
Ranfan's best 'feats' are cheap shots and narrowly dodging an attack from a still clearly flustered Namu.
He just doesn't like them. That's all.
His fear was fueled by cowardice and bigotry, believing the Saiyans would betray them the moment they have a chance even though Vegeta and his father (whom he killed) were the only ones who would have a reason to
Namu wasn't really hurt either just caught off guard and she was literally striking him in his pressure points, but couldn't really put him down.
Once he closed his eyes and got serious, all it took was a light neck chop to bring her down. That's barely more effort than Goku and co. use against...
Hard to say really. While it seems like she was hurting Namu with her attacks, it was also made clear it was only because of Namu being distracted and not really keeping his guard up, which we know leaves you vulnerable to surprise attacks.
Keep in mind, she wasn't just stripping. She was a...