Spell death or die

You went to your new school, which is an orthographic school (because you are bad at this). A teacher, who seems normal, received you in his class and asked you to sit in front of him

Teacher: I’m gonna read out some words and you need to find and spell them. You have 2 min and 35 sec to find out 60 words. If you don’t find them at the end of the time…I’ll kill you.

One more thing: he’s not a normal teacher. More you lose time, more he turns into…something…