He-he, it's look fun) but I think that Rex does not know what to do and just sits next to Six not to lose him and speaking the words of Rex faces the situation for him is clearly not funny, may be Six in unconsciousness for a serious reason (poisoned or injured...) and Rex is nothing else to do but wait help
I think Rex could not do it because he could seen as the people of Providence is dying during a battle with the EVO and maybe therefore he does not have in the arsenal of such dangerous weapons and play with them, he obviously would never want