fix time travel for when the original thread had <2 participants
fix time travel for when the original thread had <2 participants

quenda/ponymail,rbowen/ponymail,Humbedooh/ponymail,jimjag/ponymail,jimjag/ponymail,quenda/ponymail,rbowen/ponymail,jimjag/ponymail,rbowen/ponymail,Humbedooh/ponymail,Humbedooh/ponymail,jimjag/ponymail,quenda/ponymail