Gotcha and 'twould be smashing to have him along to a spooky old church~

Would it take the probable second message that "THERE ARE SWARMS OF MONSTERS UNDERNEATH THIS CHURCH, VOLUNTEERS ASSISTING IN HANDLING IT REQUIRED" to convince him that it's dire enough to head over and therefore sign him on for the second trip, or would he throw in his hat to, say, stand guard on the first trip at the initial "Something's probably very off - I'll need help investigating"?