Reasons:

• Mrs. Hall finally in a mood to bid him goodbye
• villagers not liked him, rumours of burglary spread
• stranger hungry, no response to his bell for food instead was served the bill by Mrs. Hall
• she enquired about the sudden supply of funds with him, about the mess he had created in the room
• all this angered him and he decided to teach them a lesson by unveiling himself

Incident :

• suddenly put his artificial nose in her hand, removed his spectacles, took off his hat and bandages
• all terrified, Jaffer arrived to arrest him, slapped by stranger, Jaffer caught his wrist and caught his throat. stranger kicked him
• stranger fought with all and when started losing, took off all his clothes, became completely invisible, ran away kicking and pushing all

Consequence:

• had to run away unplanned, did not carry anything with himself
• had revealed his reality to all so put himself in sensitive position 
• could not carry on with his experiments to reverse the invisibility formula