[Peter looks back to see the beaker is gone and sees the kid snatch the beaker, looks at the place on the table where the beaker was, then looks back to the beaker in the kid's hands.]
You're like, twelve [He says this even though the teen is definitely an older teen, because he's a jerk like that] so there's no way you need that more than me.
[That might be lie, because he doesn't know this kid's deal. Peter was already superheroing at a similar age. But right now, he's most concerned with making sure he has a large supply of web fluid in this place, so he can do the job at hand and help whoever needs to be helped.]
time to tussle over dangerous chemicals
You're like, twelve [He says this even though the teen is definitely an older teen, because he's a jerk like that] so there's no way you need that more than me.
[That might be lie, because he doesn't know this kid's deal. Peter was already superheroing at a similar age. But right now, he's most concerned with making sure he has a large supply of web fluid in this place, so he can do the job at hand and help whoever needs to be helped.]
[He holds out a gloved gimme hand.]
Give it.