I ran into the infinite bat as well. Very unlucky but also making it hard to keep playing after a while
Aww :/ I never had the issue when playtesting (there is a 1 in 8 chance to have combat spawn each time you enter/leave a 16x16 square. I guess you were just... Unlucky :p )
unlucky indeed, but on the bright side I got very efficient at slaying bats