Translation Check by Chrouya
Script: Dog Days' 12 [timed - xMyth][ktimed - xMyth][QC - Glis]
Workraw: Dog Days' - 12 480 AAC

127
Skyer and I can take care of the three of us with ease.
Skyer can take care of the three of us with ease.
{Only Skyer is the subject here. }

156
Anyway, the two of you have already experienced the Return Ritual.
Furthermore, the two of you have already experienced the Return Ritual.
{different adverb}

165
Just about made it...{girigiri seifu~}
Last second save...
{alternative to keep the "safe" in, although as verbal noun now}

181
Be as careful as you can, and watch where you step.
You two, please proceed carefully as you watch your step. {lit. walk as careful as possible}
{the sentence doesn't have 2 different subjects, see lit: "When you walk on the floor, please be on your alert as much as possible"}

182
I'm sorry. I should have kept my mouth shut.
{lit. I'm sorry, I activated a trap whilst saying that}

200
Hey, is that Becky?{he says "Are" Tlc~}
{no problem, probably just surprised because of the sudden Nanami clothing.}

225
If you want to use that excuse, I could have caught you with my Seven Tails before you fell. {Glis - TLC please.  This feels awkward}
If that's what you think, I should have caught you two with my Seven Tails to avoid the trap. {or: If you think you're to blame, I should have saved you two with my Seven Tails before we started falling}
{this is my attempt at making it look like better English in the right context} {should is necessary here , or I wish I could}

226
And I could have noticed that trap on the floor.
And I should have noticed that trap on the floor.
{but she didn't. No one to blame, everyone bears responsibility-ish context}

229
It's known that we are below the castle, so help is bound to come for us soon. {Glis: appended "It's known that", as it ties in with before}
{interesting addition. The Japanese language is very much simplified by means of omission through ellipsis, so adding context here makes sense.}

230
{just a fun note for translators: ~de arimasu isn't just an accent, it's a formal and archaic version of desu(meaning people still use it all around in Japan)}

238
The last return was difficult for many reasons.  {Glis: was 'on many levels.'}
The last return was disastrous for many reasons. 
{using another definition of taihen in this situation. Season One: remember all the stuff about how he's allowed to be resummoned, etc? It became a mess, with lots of trouble. Therefore, disastrous.}
{difficult would really be muzukashii in this context}

248
Rebecca is a sweet girl.
I know, Rebecca is a sweet girl.
{I missed the translation for "wakatte oru"}

265/266
I am going to do something about this.
I am not going to let my best friends get hurt!
{timing is off: I hope you can make sense from the following romaji}
265: [uchi ga nantoka suru]
266: [uchi no shin'yuu futari ni wa keshite kega nado sasen]

277
I shall hold onto it!{お預かりします tlc onegai ne~}
{no problem with this literal translation. An alternative liberal translation would be "I'll make good use of it!"}