Interesting,The most recent one was in a supplemental side aventure to Descent into Avernus called Encounters in Avernus:
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That would technically foil the initial ambush.
But, for this to make narrative sense, the abishais have clearly been observing the party. So now they know the groups schtick. They can simply wait until the next long rest (what 1 day?) and ambush them as the caster is casting tiny hut (it takes 11 minutes, plenty of time for the Abishais) which will likely be just as effective, likely more so because the group will be caught even more unaware (unless the DM allowed a weapon of warning in, just don't).
 
				 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		