to not refer The Goldstone Report for further perusal. For fear that it may derail the peace process. Then it makes perfect sense for Abbas to make it prefectly clear that if the peace process does not move forward then he will refer the Goldstone Report to the UNSC. Israel won't like it of course, but it is certainly not blackmail.
FBI: Islamic State sympathizer charged in backpack bomb plot (AP)
from the article: PA: Advance peace talks or we'll take Goldstone report to court