Questionable tactic on the players part, if you arent ready for it.Screamers calling screamers is a questionable tactic IMHO. Day 29 and level 9, I get a screamer. She screams and calls another screamer. Before I know it, I have 3 or 4 screamers and a dozen or more other zeds. Hmmmpf....minibike and GTFO!
If you are ready I love the option to create your own hordes, especially with zombies being more scarce than in some past alphas. (except horde nights)
There are workarounds to not get in that situation for the player.