As for my 2 cents worth.
I am a PADI Dive Master and i would never take a diver me as you described and definitely not on a "twilight" dive. Never happen with me. Even if a certified, which you suggested that she is not, when someone has less not dived in less than 6 months, I want to know that they did a Scuba Review in the pool or confined water and i do a checkout dive. As for the blood in the mask, then the diving is over....done...caput. As for negligence, every dive master has their own jusdgement as ot a person's abilities and i do not have enough information to assess any legal negligence but it would not look good to me as i explained above.
I hope this helps.
regards
I am a PADI Dive Master and i would never take a diver me as you described and definitely not on a "twilight" dive. Never happen with me. Even if a certified, which you suggested that she is not, when someone has less not dived in less than 6 months, I want to know that they did a Scuba Review in the pool or confined water and i do a checkout dive. As for the blood in the mask, then the diving is over....done...caput. As for negligence, every dive master has their own jusdgement as ot a person's abilities and i do not have enough information to assess any legal negligence but it would not look good to me as i explained above.
I hope this helps.
regards