You can mask the instant Dipsy comes in and you'll be fine, but it is an instant kill if you were on cams during the attack. İf you need to be more precise, he enters roughly 3 to 4 seconds after disappearing from the cams.
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yeah i made it to night 5 and you might be wondering "why did it took so long?" its because i was stuck night 3 for like 4 months or something until i made it to night 4 where i decided to not touch the game again however i managed to get night 5 probably after alot and i mean... ALOT of skill and practice because i played another fnaf fangames with fast paced gameplay and with knowledge of fnaf games so i beaten night 4! i all i need to do is complete night 5.... if i touch the game again after like.... 4 months or something